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Frequently Asked Questions
thinx 101
Our underwear for periods absorbs your flow, blocks out odor, wicks moisture, and prevents leaks — so you feel fresh, dry, and comfortable! No pads, tampons, or other period products are needed. Our period-absorbing underwear is washable and reusable — providing a more sustainable alternative to single-use disposable products.
Our absorbent styles hold from 1 regular tampon worth of flow to 5 regular tampons worth, so there is a style right for each day of your cycle. We recommend trying Thinx period-absorbing underwear for the first time at home to see how each underwear style works with your ~flow~.
The gusset positioning varies by style. For example, for our heavy & super styles, the gusset provides additional coverage throughout the front and back in order to catch heavier flows as the person moves, sleeps, etc. In styles that provide protection against lighter flows, the gusset isn’t positioned as far back, but still provides excellent leak protection.
Thinx period-absorbing underwear handles blood clots similarly to a pad. Although the undies can't absorb the blood clot itself, they will absorb the surrounding moisture so you will not feel damp, wet, or uncomfortable.
Toxic Shock Syndrome (TSS) is associated primarily with tampon use. Period-absorbing underwear is a safer alternative.
Our sustainable period-absorbing underwear is ultra-absorbent, odor-controlling, and moisture-wicking, designed to keep you fresh and dry. If your undies have not reached capacity, we recommend changing them once daily, as you would regular underwear. If your period begins to smell different (unusually fishy), that might mean something is amiss down there, and it might be a good idea to check in with your doctor.
Our period-absorbing underwear is 100% latex-free! Our elastane is composed of a long-chain polymer known as polyurethane, known in technical circles as a polyether-polyurea copolymer, used for having breathable and water-resistant qualities. Elastane is an entirely synthetic fabric; it does not exist anywhere in nature nor contains organic materials. So, no latex! However, a number of our styles do feature exposed elastic.
Yes! We don’t apply any perfume or fragrance to any of our materials. All of our products are fragrance-free!
Our absorbent underwear isn’t stain-proof, although the materials used in our absorbent gusset are largely stain-resistant. Plus, they’re lined in black to prevent stains from showing. To further prevent stains, follow the washing instructions on our How to Wash page.
Our period-absorbing underwear is made safely with fabrics like cotton, polyamide, modal, polyester, and elastane (for a little stretch!). Our underwear is not made or treated with PFAS.
Our underwear for periods absorbs your flow, blocks out odor, wicks moisture, and prevents leaks — so you feel fresh, dry, and comfortable! No pads, tampons, or other period products are needed. Our period-absorbing underwear is washable and reusable — providing a more sustainable alternative to single-use disposable products.
Our absorbent styles hold from 1 regular tampon worth of flow to 5 regular tampons worth, so there is a style right for each day of your cycle. We recommend trying Thinx period-absorbing underwear for the first time at home to see how each underwear style works with your ~flow~.
The gusset positioning varies by style. For example, for our heavy & super styles, the gusset provides additional coverage throughout the front and back in order to catch heavier flows as the person moves, sleeps, etc. In styles that provide protection against lighter flows, the gusset isn’t positioned as far back, but still provides excellent leak protection.
Thinx period-absorbing underwear handles blood clots similarly to a pad. Although the undies can't absorb the blood clot itself, they will absorb the surrounding moisture so you will not feel damp, wet, or uncomfortable.
Toxic Shock Syndrome (TSS) is associated primarily with tampon use. Period-absorbing underwear is a safer alternative.
Our sustainable period-absorbing underwear is ultra-absorbent, odor-controlling, and moisture-wicking, designed to keep you fresh and dry. If your undies have not reached capacity, we recommend changing them once daily, as you would regular underwear. If your period begins to smell different (unusually fishy), that might mean something is amiss down there, and it might be a good idea to check in with your doctor.
Our period-absorbing underwear is 100% latex-free! Our elastane is composed of a long-chain polymer known as polyurethane, known in technical circles as a polyether-polyurea copolymer, used for having breathable and water-resistant qualities. Elastane is an entirely synthetic fabric; it does not exist anywhere in nature nor contains organic materials. So, no latex! However, a number of our styles do feature exposed elastic.
Yes! We don’t apply any perfume or fragrance to any of our materials. All of our products are fragrance-free!
Our absorbent underwear isn’t stain-proof, although the materials used in our absorbent gusset are largely stain-resistant. Plus, they’re lined in black to prevent stains from showing. To further prevent stains, follow the washing instructions on our How to Wash page.
Our period-absorbing underwear is made safely with fabrics like cotton, polyamide, modal, polyester, and elastane (for a little stretch!). Our underwear is not made or treated with PFAS.
select *your* style
We recommend following the hip measurement to find the most accurate size. Be sure to measure your hips at their widest point, derrière included! We recommend sizing up in underwear styles that fit below the natural waist, or if you're looking for the best fit postpartum. The underwear should fit snugly but not so tight that it becomes uncomfortable.
Our period-absorbing underwear styles range in absorbency levels, from lightest to super, so there is a pair for every phase of your flow! Our light and lightest absorbencies are great for spotting and days at the end of your period. For some, our moderate absorbency styles can be a replacement for disposable period products, and for others, they can be a backup to tampons or menstrual cups on heavier days. Heavy and super styles can completely replace other period products and can also be great for overnight use!
Our Modal Cotton collection is our most breathable, lightweight, and eco-friendly fabric yet, made with a fabric blend composed of TENCEL™ Modal and SUPIMA® Cotton. Our Modal Cotton styles also feature extended gussets in the front and back for extra leak coverage.
We used SUPIMA® cotton, sourced through the Better Cotton Initiative (BCI). BCI is a non-profit working towards improving global cotton production for the people who produce it and the environment it grows in. BCI owns and stewards the Better Cotton Standard System: a system that encompasses a diverse range of activities and stakeholders, including those in cotton production, through the supply chain to consumer-facing retailers and brands.
Our Modal Cotton collection is an excellent choice for those with sensitive skin. If you typically wear cotton, Modal Cotton should not irritate you, being that it is an all-natural fabric, and it should only get softer over time with washing. Another great choice would be our cotton Thinx for All™ collection.
We recommend following the hip measurement to find the most accurate size. Be sure to measure your hips at their widest point, derrière included! We recommend sizing up in underwear styles that fit below the natural waist, or if you're looking for the best fit postpartum. The underwear should fit snugly but not so tight that it becomes uncomfortable.
Our period-absorbing underwear styles range in absorbency levels, from lightest to super, so there is a pair for every phase of your flow! Our light and lightest absorbencies are great for spotting and days at the end of your period. For some, our moderate absorbency styles can be a replacement for disposable period products, and for others, they can be a backup to tampons or menstrual cups on heavier days. Heavy and super styles can completely replace other period products and can also be great for overnight use!
Our Modal Cotton collection is our most breathable, lightweight, and eco-friendly fabric yet, made with a fabric blend composed of TENCEL™ Modal and SUPIMA® Cotton. Our Modal Cotton styles also feature extended gussets in the front and back for extra leak coverage.
We used SUPIMA® cotton, sourced through the Better Cotton Initiative (BCI). BCI is a non-profit working towards improving global cotton production for the people who produce it and the environment it grows in. BCI owns and stewards the Better Cotton Standard System: a system that encompasses a diverse range of activities and stakeholders, including those in cotton production, through the supply chain to consumer-facing retailers and brands.
Our Modal Cotton collection is an excellent choice for those with sensitive skin. If you typically wear cotton, Modal Cotton should not irritate you, being that it is an all-natural fabric, and it should only get softer over time with washing. Another great choice would be our cotton Thinx for All™ collection.
how to use
Depending on your flow, Thinx replaces the need for disposable products, such as pads, tampons, liners, and cups. For most flows, Thinx can last all day! Others may need an extra pair of Thinx as a backup, just in case!
Every flow is different! You can wear Thinx underwear for periods for as long as your flow allows. The absorbency style also plays a factor, as some underwear styles are more absorbent than others.
When you start to notice blood at the seams, that's a good indication that it's time to change pairs! We suggest bringing along a resealable bag, pouch, or wet bag — so that if you need to change out of your first pair of Thinx undies, you've got a place to put them.
We recommend starting with 3-5 pairs, so you’re covered for your entire period without having to do extra laundry. We offer Saver Sets and Custom Set discounts so you can build your collection and get more for less. Take our Know Your Flow quiz to find which underwear styles work best for your flow!
We've heard from many parents in our community that they love wearing Thinx and Thinx for All Leaks underwear when their periods return postpartum! We've identified the styles from our collections best suited for this time and curated them into Postpartum Sets. Our undies provide leak protection you can trust when your period returns postpartum. Check with your doctor before using any new product. Learn more about how new parents use our underwear for life postpartum.
To get the best use out of your Thinx, we don’t recommend wearing these undies as a swimsuit or underwater. The purpose is to keep you fresh and dry!
Our sister brand, Thinx for All Leaks is designed specifically to absorb bladder leaks!
Depending on your flow, Thinx replaces the need for disposable products, such as pads, tampons, liners, and cups. For most flows, Thinx can last all day! Others may need an extra pair of Thinx as a backup, just in case!
Every flow is different! You can wear Thinx underwear for periods for as long as your flow allows. The absorbency style also plays a factor, as some underwear styles are more absorbent than others.
When you start to notice blood at the seams, that's a good indication that it's time to change pairs! We suggest bringing along a resealable bag, pouch, or wet bag — so that if you need to change out of your first pair of Thinx undies, you've got a place to put them.
We recommend starting with 3-5 pairs, so you’re covered for your entire period without having to do extra laundry. We offer Saver Sets and Custom Set discounts so you can build your collection and get more for less. Take our Know Your Flow quiz to find which underwear styles work best for your flow!
We've heard from many parents in our community that they love wearing Thinx and Thinx for All Leaks underwear when their periods return postpartum! We've identified the styles from our collections best suited for this time and curated them into Postpartum Sets. Our undies provide leak protection you can trust when your period returns postpartum. Check with your doctor before using any new product. Learn more about how new parents use our underwear for life postpartum.
To get the best use out of your Thinx, we don’t recommend wearing these undies as a swimsuit or underwater. The purpose is to keep you fresh and dry!
Our sister brand, Thinx for All Leaks is designed specifically to absorb bladder leaks!
how to care
Our sustainable period underwear is super easy to care for. Machine wash the undies with the rest of your laundry on a cold cycle before first wear and after each use. Steer clear of fabric softener and bleach. Hang dry to keep your undies at maximum performance. Do not iron.
Machine-wash your Thinx on cold. The standard cold wash is 60-80 degrees Fahrenheit (15C - 27C). If you're hand-washing, the water should feel close to room temperature.
Yep! Washing our leak-absorbing underwear with your other laundry is perfectly hygienic, and your other clothes will be fine. Washing machines will dilute the contents almost immediately, and your other clothes will not stain if you're washing on cold.
We discourage using fabric softener because it breaks down the fabrics in the center panel of the underwear and the bonding around the seams, which helps absorb and keep leaks in. Over time, fabric softener will make the underwear less absorbent.
The drying time of our period-absorbing underwear depends on the style — moderate absorbency styles shouldn’t take longer than 10-12 hours to dry, and super absorbency styles shouldn’t take longer than 19 hours to dry under non-humid conditions. Drying times may be affected by humidity levels and the airflow of the space you hang them in.
Our absorbent underwear isn’t stain-proof, although the materials used in our absorbent gusset are largely stain-resistant. Plus, they’re lined in black to prevent stains from showing. To further prevent stains, follow our washing instructions.
For future uses, consider rinsing out the undies following wear (especially if you might not be washing them for a day or two). You can also give them a little soak in warm, but not hot, water with some gentle detergent before washing as usual.
Don't panic — a few cycles in the dryer won't hurt your period-absorbing underwear. However, repeated exposure to the heat from dryers or irons will affect the underwear's elasticity, which helps prevent leaks, so don't make it a habit!
Pro tip: Use a mesh laundry bag to separate them from your other clothes for easy removal from the wash while the rest goes in the dryer.Follow our simple care instructions to keep your period-absorbing underwear at maximum performance. Replace them at 30 washes.
We know that some of our fibers do not decompose quickly into the soil — however, we’re proud to say that you *can* recycle our period underwear!
Here’s how to do it:- Wash your Thinx until they’re squeaky clean
- Cut out the absorbent gusset layer ✂
- Drop off the remaining fabric in a textile recycling bin ♻
Textile scraps can be re-purposed into carpet padding, car filling, insulation, etc. Downcycling and upcycling are great ways to ensure that garments can live beyond their lifetime!
Our sustainable period underwear is super easy to care for. Machine wash the undies with the rest of your laundry on a cold cycle before first wear and after each use. Steer clear of fabric softener and bleach. Hang dry to keep your undies at maximum performance. Do not iron.
Machine-wash your Thinx on cold. The standard cold wash is 60-80 degrees Fahrenheit (15C - 27C). If you're hand-washing, the water should feel close to room temperature.
Yep! Washing our leak-absorbing underwear with your other laundry is perfectly hygienic, and your other clothes will be fine. Washing machines will dilute the contents almost immediately, and your other clothes will not stain if you're washing on cold.
We discourage using fabric softener because it breaks down the fabrics in the center panel of the underwear and the bonding around the seams, which helps absorb and keep leaks in. Over time, fabric softener will make the underwear less absorbent.
The drying time of our period-absorbing underwear depends on the style — moderate absorbency styles shouldn’t take longer than 10-12 hours to dry, and super absorbency styles shouldn’t take longer than 19 hours to dry under non-humid conditions. Drying times may be affected by humidity levels and the airflow of the space you hang them in.
Our absorbent underwear isn’t stain-proof, although the materials used in our absorbent gusset are largely stain-resistant. Plus, they’re lined in black to prevent stains from showing. To further prevent stains, follow our washing instructions.
For future uses, consider rinsing out the undies following wear (especially if you might not be washing them for a day or two). You can also give them a little soak in warm, but not hot, water with some gentle detergent before washing as usual.
Don't panic — a few cycles in the dryer won't hurt your period-absorbing underwear. However, repeated exposure to the heat from dryers or irons will affect the underwear's elasticity, which helps prevent leaks, so don't make it a habit!
Pro tip: Use a mesh laundry bag to separate them from your other clothes for easy removal from the wash while the rest goes in the dryer.Follow our simple care instructions to keep your period-absorbing underwear at maximum performance. Replace them at 30 washes.
We know that some of our fibers do not decompose quickly into the soil — however, we’re proud to say that you *can* recycle our period underwear!
Here’s how to do it:- Wash your Thinx until they’re squeaky clean
- Cut out the absorbent gusset layer ✂
- Drop off the remaining fabric in a textile recycling bin ♻
Textile scraps can be re-purposed into carpet padding, car filling, insulation, etc. Downcycling and upcycling are great ways to ensure that garments can live beyond their lifetime!
orders + shipping
Getting familiar with period products before you need them is a great idea! Wearing Thinx before getting your period can ensure you have the correct size and style to fit your needs.
Shop our site to get leak protection delivered to your door. To shop Thinx Inc. undies in person, check out our store locator Please note we do not accept returns or exchanges for purchases made from third-party retailers.
While we do our best to ensure that our e-commerce experience is consistent, enjoyable, and functional across all modern browsers and devices, occasionally something small may not function properly on older browsers when an update to our code is pushed.
If you are having trouble logging in, creating an account, or placing an order, we highly recommend you first update your browser to the newest version.
Chrome | Firefox | Safari | Internet Explorer
Or, simply trying another browser usually works (we prefer Chrome).
We apologize for any inconvenience. If you still need help or are experiencing issues, please don't hesitate to contact us via our Help Center!We accept nearly all local currencies. The currency will update automatically update based on your location! We provide fixed prices in the local currency for Canada, Australia, New Zealand, and the United Kingdom. The product price for the other countries is calculated based on their daily exchange rate. Order receipts and confirmation emails show the purchase price in local currencies.
We accept all major credit cards, including Flexible Spending Arrangement (FSA), Health Savings Account (HSA), and Health Reimbursement Arrangement (HRA) credit/debit cards. Express checkout is available via Shop Pay, PayPal, and Google Pay. Shop with your Thinx Inc. gift card that never expires. Or, buy now, pay later with AfterPay. Additional payment options may be available for select International countries.
Yes — all Thinx inc. underwear, including our menstrual products and bladder leak underwear, can now be purchased directly at checkout and via PayPal using Flexible Spending Arrangement (FSA), Health Savings Account (HSA), and Health Reimbursement Arrangement (HRA) credit/debit cards. If you experience any issues with the card at checkout, please check your balance — if there are enough funds in your account, you may need to contact an administrator at your plan to authorize a purchase on our site. Afterpay and orders processed in currencies other than USD are not eligible. If you prefer to check out using another method, please review your plan for details about applying for reimbursement. Depending on your insurance plan, you may be required to fill out a claim form with an itemized receipt, so keep your order confirmation email handy.
Customers in the United States can get free Standard Shipping on their first order when they create an account.
Our orders ship from our warehouse in Northampton, PA.
Yes! We currently ship to 24 countries around the world. Check our Shipping Policy to view our shipping rates and the list of countries we ship to. If your country isn't on that list, we apologize for any inconvenience! Check out our Store Locator to see if any retailers that serve you offer our products.
For orders shipping to Canada, the product price includes duties but does not include taxes (collected at checkout). For all the other countries we ship to, the product price includes duties and taxes.
Our team begins processing orders quickly (so you can get your undies fast!) so unfortunately, we're unable to make order edits or cancellations. We do offer a 45-day money-back guarantee. Once your order has shipped, you can visit our Returns Portal to process a refund or swap anything out.
Orders are processed Mon-Fri, before 5 pm EST, and are typically on their way to you within 1-2 business days. Delivery estimates vary by country. For additional shipping information and rates by country, view our Shipping Policy.
Track your order progress step by step. As soon as your order has completed processing, you'll receive a shipping confirmation with your order tracking details. If you placed the order under your account, you'll also see your tracking information under "order history" when you log in.
Getting familiar with period products before you need them is a great idea! Wearing Thinx before getting your period can ensure you have the correct size and style to fit your needs.
Shop our site to get leak protection delivered to your door. To shop Thinx Inc. undies in person, check out our store locator Please note we do not accept returns or exchanges for purchases made from third-party retailers.
While we do our best to ensure that our e-commerce experience is consistent, enjoyable, and functional across all modern browsers and devices, occasionally something small may not function properly on older browsers when an update to our code is pushed.
If you are having trouble logging in, creating an account, or placing an order, we highly recommend you first update your browser to the newest version.
Chrome | Firefox | Safari | Internet Explorer
Or, simply trying another browser usually works (we prefer Chrome).
We apologize for any inconvenience. If you still need help or are experiencing issues, please don't hesitate to contact us via our Help Center!We accept nearly all local currencies. The currency will update automatically update based on your location! We provide fixed prices in the local currency for Canada, Australia, New Zealand, and the United Kingdom. The product price for the other countries is calculated based on their daily exchange rate. Order receipts and confirmation emails show the purchase price in local currencies.
We accept all major credit cards, including Flexible Spending Arrangement (FSA), Health Savings Account (HSA), and Health Reimbursement Arrangement (HRA) credit/debit cards. Express checkout is available via Shop Pay, PayPal, and Google Pay. Shop with your Thinx Inc. gift card that never expires. Or, buy now, pay later with AfterPay. Additional payment options may be available for select International countries.
Yes — all Thinx inc. underwear, including our menstrual products and bladder leak underwear, can now be purchased directly at checkout and via PayPal using Flexible Spending Arrangement (FSA), Health Savings Account (HSA), and Health Reimbursement Arrangement (HRA) credit/debit cards. If you experience any issues with the card at checkout, please check your balance — if there are enough funds in your account, you may need to contact an administrator at your plan to authorize a purchase on our site. Afterpay and orders processed in currencies other than USD are not eligible. If you prefer to check out using another method, please review your plan for details about applying for reimbursement. Depending on your insurance plan, you may be required to fill out a claim form with an itemized receipt, so keep your order confirmation email handy.
Customers in the United States can get free Standard Shipping on their first order when they create an account.
Our orders ship from our warehouse in Northampton, PA.
Yes! We currently ship to 24 countries around the world. Check our Shipping Policy to view our shipping rates and the list of countries we ship to. If your country isn't on that list, we apologize for any inconvenience! Check out our Store Locator to see if any retailers that serve you offer our products.
For orders shipping to Canada, the product price includes duties but does not include taxes (collected at checkout). For all the other countries we ship to, the product price includes duties and taxes.
Our team begins processing orders quickly (so you can get your undies fast!) so unfortunately, we're unable to make order edits or cancellations. We do offer a 45-day money-back guarantee. Once your order has shipped, you can visit our Returns Portal to process a refund or swap anything out.
Orders are processed Mon-Fri, before 5 pm EST, and are typically on their way to you within 1-2 business days. Delivery estimates vary by country. For additional shipping information and rates by country, view our Shipping Policy.
Track your order progress step by step. As soon as your order has completed processing, you'll receive a shipping confirmation with your order tracking details. If you placed the order under your account, you'll also see your tracking information under "order history" when you log in.
returns + exchanges
We offer a 45-day trial on all orders, so if you’re unhappy with your purchase, we’ll try to make it right. Final sale items, Thinx “merch”, and gift cards are nonrefundable. Visit our online Returns Portal to begin a return or exchange.
Items can be exchanged for a different color/size, or a different style of equal or lesser value, refunded for a digital gift card, or refunded to the original payment method. Terms and Conditions may apply.
Sorry, that option isn’t available right now!
The process for refunding the original form of payment will be the same. Digital gift cards are only available to customers within the United States. If you are located within the U.S. and looking to exchange for a different underwear size/color or for another style, you can do so through our online Returns Portal. If you are outside the U.S., please reach out to our customer service team with your order number, exchange details (style, size, color, absorbency), and shipping address and we’ll process a manual exchange on your behalf.
Nope! Instead, we encourage you to pass unused pairs along to a friend or donate them to a local women's shelter.
Items purchased in a Saver Set or Custom Set can be exchanged or returned individually. You can process a return or exchange directly through our online Returns Portal.
If you’re a customer located within the United States, we suggest returning the original item for a digital gift card. If you’re a customer outside of the U.S., we recommend returning the original item for a refund. In either case, be sure to sign up for back-in-stock alerts on your desired item's product page, so you'll be notified when it becomes available for purchase again.
Once your return is processed, you should see the funds appear back on your original form of payment in about 5-7 business days.
We typically process return orders within 1–2 business days. Once processed, US exchange orders are shipped via standard shipping and should arrive within 5–7 business days. International exchange orders are shipped via UPS Worldwide Expedited DDP.
Nope, gift cards never expire and can be applied to any purchase from our Thinx Inc. family of brands (Thinx for All Leaks, Thinx, and Thinx Teens)!
All you need is the gift card number to use your credit. How you choose to use your credit or whether you choose to give your gift card number to a friend is up to you!
We offer a 45-day trial on all orders, so if you’re unhappy with your purchase, we’ll try to make it right. Final sale items, Thinx “merch”, and gift cards are nonrefundable. Visit our online Returns Portal to begin a return or exchange.
Items can be exchanged for a different color/size, or a different style of equal or lesser value, refunded for a digital gift card, or refunded to the original payment method. Terms and Conditions may apply.
Sorry, that option isn’t available right now!
The process for refunding the original form of payment will be the same. Digital gift cards are only available to customers within the United States. If you are located within the U.S. and looking to exchange for a different underwear size/color or for another style, you can do so through our online Returns Portal. If you are outside the U.S., please reach out to our customer service team with your order number, exchange details (style, size, color, absorbency), and shipping address and we’ll process a manual exchange on your behalf.
Nope! Instead, we encourage you to pass unused pairs along to a friend or donate them to a local women's shelter.
Items purchased in a Saver Set or Custom Set can be exchanged or returned individually. You can process a return or exchange directly through our online Returns Portal.
If you’re a customer located within the United States, we suggest returning the original item for a digital gift card. If you’re a customer outside of the U.S., we recommend returning the original item for a refund. In either case, be sure to sign up for back-in-stock alerts on your desired item's product page, so you'll be notified when it becomes available for purchase again.
Once your return is processed, you should see the funds appear back on your original form of payment in about 5-7 business days.
We typically process return orders within 1–2 business days. Once processed, US exchange orders are shipped via standard shipping and should arrive within 5–7 business days. International exchange orders are shipped via UPS Worldwide Expedited DDP.
Nope, gift cards never expire and can be applied to any purchase from our Thinx Inc. family of brands (Thinx for All Leaks, Thinx, and Thinx Teens)!
All you need is the gift card number to use your credit. How you choose to use your credit or whether you choose to give your gift card number to a friend is up to you!
mission + ethics
We aim to create underwear that champions and supports bodies throughout different stages of life. From your first period to post-menopause and all the leaks in between. We aim to empower our customers with sustainable solutions while breaking taboos around bladder leaks and menstruation.
We craft our underwear carefully and consciously, from sustainable manufacturing processes to ethical working conditions. We’re proud to work with MAS, a global leader in ethical manufacturing based in Sri Lanka. MAS operates under three pillars: products changed for good, our planet changed for good, and lives changed for good. Visit our Manufacturing page to learn more about how we make our underwear and the incredible people who make them!
Since day one, giving back to our community has been at the core of our mission. We're committed to paying it forward through our giveback programs and initiatives. When you purchase Thinx products, you're supporting our mission to empower *every body* through advocating for sustainable, scalable solutions to ending period poverty — learn more about GiveRise. In addition, we're honored to team up with organizations doing incredible work as our quarterly cart donation partners. Past partners have included The Trevor Project, the Black Mamas Matter Alliance, the Chicago Period Project, and others.
We actively support menstrual equity through partnerships with non-profits and community-based organizations. You can read more about our GiveRise program. If your organization is seeking a donation, please contact GiveRise@shethinx.com.
We aim to create underwear that champions and supports bodies throughout different stages of life. From your first period to post-menopause and all the leaks in between. We aim to empower our customers with sustainable solutions while breaking taboos around bladder leaks and menstruation.
We craft our underwear carefully and consciously, from sustainable manufacturing processes to ethical working conditions. We’re proud to work with MAS, a global leader in ethical manufacturing based in Sri Lanka. MAS operates under three pillars: products changed for good, our planet changed for good, and lives changed for good. Visit our Manufacturing page to learn more about how we make our underwear and the incredible people who make them!
Since day one, giving back to our community has been at the core of our mission. We're committed to paying it forward through our giveback programs and initiatives. When you purchase Thinx products, you're supporting our mission to empower *every body* through advocating for sustainable, scalable solutions to ending period poverty — learn more about GiveRise. In addition, we're honored to team up with organizations doing incredible work as our quarterly cart donation partners. Past partners have included The Trevor Project, the Black Mamas Matter Alliance, the Chicago Period Project, and others.
We actively support menstrual equity through partnerships with non-profits and community-based organizations. You can read more about our GiveRise program. If your organization is seeking a donation, please contact GiveRise@shethinx.com.
about our brands
Thinx Inc. is our parent company! Together our family of brands (Thinx for All Leaks, Thinx, and Thinx Teens) is committed to empowering *every body* with innovative solutions and social change.
Thinx Teens are machine-washable, reusable period-absorbing underwear for teens. Each pair is moisture-wicking, ultra-absorbent, and leak-resistant. Best of all, they come in full-coverage underwear styles and fun colors that fit teen bodies!
Thinx Teens are period-absorbing underwear made for teen body shapes and sizes. We designed Thinx underwear for periods for adult bodies (people who have already finished puberty), made with taller, curvier adult bodies in mind. Use our handy size chart to toggle between the brands to find the best underwear size for you. We recommend following the hip measurement, as most of our underwear styles sit on the hips. Be sure to measure the hips at their widest point, derriere included!
Thinx for All Leaks is washable and reusable underwear for bladder leaks — giving you a more sustainable alternative to single-use disposable products. Thinx for All Leaks features three layers of absorbent technology in the gusset: an innermost layer of moisture-wicking cotton, an ultra-absorbent inner lining, and an outermost layer that acts as a leak-resistant barrier. Learn more about our underwear for bladder leaks and how they work.
Thinx and Thinx for All Leaks are reusable, absorbent underwear designed to replace disposable products. They absorb leaks, control odors, and wick away moisture to keep you dry and comfortable. They look and feel like regular underwear so you can wear, wash, and reuse them. Thinx absorbs period flow, while Thinx for All Leaks is underwear for bladder leakage. The products' layer composition differs to handle the variations in pH and viscosity for different types of leaks.
We specifically designed Thinx for All Leaks to tackle the pH and viscosity of bladder leaks, which is lower than that of menstrual flow. If you experience light incontinence and your period, Thinx for All Leaks would be your best bet to prevent all your leaks. We don't recommend using our period underwear to protect against bladder leaks.
The construction of Thinx for All Leaks underwear for bladder leaks differs from Thinx, as do the underwear styles, so sizing is a bit different. Thinx includes industry-standard plus-sizing through 4X, while Thinx for All Leaks sizes extend to 5XL. We recommend following the hip measurement for both brands to find the most accurate size for you, as most of our underwear styles sit on the hips.
You deserve period products that give you the most comfort physically, mentally, and emotionally. All underwear in the Thinx family of brands has been certified based on the rigorous chemical safety requirements of the STANDARD 100 by OEKO-TEX® [20.HUS.04850 | HOHENSTEIN HTTI] since 2020 and now complies with the even more stringent OEKO-TEX® 100 Class II, Annexure IV, which includes meeting the requirements for Europe’s Regulation for Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) [20.HUS.04850 | HOHENSTEIN HTTI]. Thinx underwear is not made with PFAS.
We also test our finished products through an accredited, globally recognized third-party laboratory to help ensure they are compliant with U.S. and international regulations. These tests also include absorbency capacity, usability, and wearability.
Thinx is a member of the Apparel and Footwear International RSL Management Group (AFIRM) and aligns with the AFIRM restricted substances list (RSL) for suppliers of raw materials. We also require suppliers of our raw materials to sign a Supplier Code of Conduct and Chemical Supplier Agreement confirming compliance to the AFIRM RSL including the AFIRM restrictions on PFAS.We strive to make environmentally preferable choices that don’t compromise the integrity of the product that shows up on your doorstep. That means we choose paper and renewable resources as much as possible and work to minimize any plastic or non-renewable materials.
Paper: All paper and boards are FSC-certified (both old and new packaging, including inserts and boxes). They are all recyclable and biodegradable! It will take approx. 2-3 months for this process.
Polybag: Biodegradable.
Strings: Not recyclable but can give to a textile recycler. 65% Polyester and 35% cotton.
Mailer bag: Recyclable where plastic films are recyclable. Find a location here.
We are currently researching how to use biodegradable and recyclable packaging with soy-based or similar inks, as our supply chain and safe handling requirements allow.Check out our Careers page.
Thinx Inc. is our parent company! Together our family of brands (Thinx for All Leaks, Thinx, and Thinx Teens) is committed to empowering *every body* with innovative solutions and social change.
Thinx Teens are machine-washable, reusable period-absorbing underwear for teens. Each pair is moisture-wicking, ultra-absorbent, and leak-resistant. Best of all, they come in full-coverage underwear styles and fun colors that fit teen bodies!
Thinx Teens are period-absorbing underwear made for teen body shapes and sizes. We designed Thinx underwear for periods for adult bodies (people who have already finished puberty), made with taller, curvier adult bodies in mind. Use our handy size chart to toggle between the brands to find the best underwear size for you. We recommend following the hip measurement, as most of our underwear styles sit on the hips. Be sure to measure the hips at their widest point, derriere included!
Thinx for All Leaks is washable and reusable underwear for bladder leaks — giving you a more sustainable alternative to single-use disposable products. Thinx for All Leaks features three layers of absorbent technology in the gusset: an innermost layer of moisture-wicking cotton, an ultra-absorbent inner lining, and an outermost layer that acts as a leak-resistant barrier. Learn more about our underwear for bladder leaks and how they work.
Thinx and Thinx for All Leaks are reusable, absorbent underwear designed to replace disposable products. They absorb leaks, control odors, and wick away moisture to keep you dry and comfortable. They look and feel like regular underwear so you can wear, wash, and reuse them. Thinx absorbs period flow, while Thinx for All Leaks is underwear for bladder leakage. The products' layer composition differs to handle the variations in pH and viscosity for different types of leaks.
We specifically designed Thinx for All Leaks to tackle the pH and viscosity of bladder leaks, which is lower than that of menstrual flow. If you experience light incontinence and your period, Thinx for All Leaks would be your best bet to prevent all your leaks. We don't recommend using our period underwear to protect against bladder leaks.
The construction of Thinx for All Leaks underwear for bladder leaks differs from Thinx, as do the underwear styles, so sizing is a bit different. Thinx includes industry-standard plus-sizing through 4X, while Thinx for All Leaks sizes extend to 5XL. We recommend following the hip measurement for both brands to find the most accurate size for you, as most of our underwear styles sit on the hips.
You deserve period products that give you the most comfort physically, mentally, and emotionally. All underwear in the Thinx family of brands has been certified based on the rigorous chemical safety requirements of the STANDARD 100 by OEKO-TEX® [20.HUS.04850 | HOHENSTEIN HTTI] since 2020 and now complies with the even more stringent OEKO-TEX® 100 Class II, Annexure IV, which includes meeting the requirements for Europe’s Regulation for Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) [20.HUS.04850 | HOHENSTEIN HTTI]. Thinx underwear is not made with PFAS.
We also test our finished products through an accredited, globally recognized third-party laboratory to help ensure they are compliant with U.S. and international regulations. These tests also include absorbency capacity, usability, and wearability.
Thinx is a member of the Apparel and Footwear International RSL Management Group (AFIRM) and aligns with the AFIRM restricted substances list (RSL) for suppliers of raw materials. We also require suppliers of our raw materials to sign a Supplier Code of Conduct and Chemical Supplier Agreement confirming compliance to the AFIRM RSL including the AFIRM restrictions on PFAS.We strive to make environmentally preferable choices that don’t compromise the integrity of the product that shows up on your doorstep. That means we choose paper and renewable resources as much as possible and work to minimize any plastic or non-renewable materials.
Paper: All paper and boards are FSC-certified (both old and new packaging, including inserts and boxes). They are all recyclable and biodegradable! It will take approx. 2-3 months for this process.
Polybag: Biodegradable.
Strings: Not recyclable but can give to a textile recycler. 65% Polyester and 35% cotton.
Mailer bag: Recyclable where plastic films are recyclable. Find a location here.
We are currently researching how to use biodegradable and recyclable packaging with soy-based or similar inks, as our supply chain and safe handling requirements allow.Check out our Careers page.
period info
Once a month, your body prepares for one egg to be fertilized. During this time, the lining of your uterus thickens around the egg. When you don’t become pregnant, your body sheds the built-up lining of the uterus that was prepared for the egg to be fertilized and releases the unfertilized egg. Menstrual blood and tissue flow from the uterus through the cervix and out of the body through the vagina. To learn more, check out our blog.
Your period is one phase of your menstrual cycle which typically lasts 21-45 days. The ~flow~ of blood and tissue you experience (aka your period!) happens about halfway through that cycle, roughly once a month and lasting, on average, 3 to 7 days. For more information on irregular periods, check out our blog.
The amount of blood that comes out of the cervix each month varies, but it can be anywhere from 4 tsp to 1 cup.
There are quite a few factors that can influence the color of your period blood, including your diet, hormone levels, and even stress. Check out our blog for the download on each shade of your flow.
PMS, or premenstrual syndrome, is often defined by the physical and emotional symptoms you may feel before you get your period. The fluctuation of estrogen and progesterone hormones is responsible for symptoms such as cramps, bloating, sore boobs, fatigue, moodiness, breakouts, diarrhea, nausea, headaches, irritability, mood swings, food cravings, anxiety, and more (fun, we know!). PMS symptoms often show up a few days before your flow begins and can function as helpful signs to let you know when to keep your period undies on hand!
Once a month, your body prepares for one egg to be fertilized. During this time, the lining of your uterus thickens around the egg. When you don’t become pregnant, your body sheds the built-up lining of the uterus that was prepared for the egg to be fertilized and releases the unfertilized egg. Menstrual blood and tissue flow from the uterus through the cervix and out of the body through the vagina. To learn more, check out our blog.
Your period is one phase of your menstrual cycle which typically lasts 21-45 days. The ~flow~ of blood and tissue you experience (aka your period!) happens about halfway through that cycle, roughly once a month and lasting, on average, 3 to 7 days. For more information on irregular periods, check out our blog.
The amount of blood that comes out of the cervix each month varies, but it can be anywhere from 4 tsp to 1 cup.
There are quite a few factors that can influence the color of your period blood, including your diet, hormone levels, and even stress. Check out our blog for the download on each shade of your flow.
PMS, or premenstrual syndrome, is often defined by the physical and emotional symptoms you may feel before you get your period. The fluctuation of estrogen and progesterone hormones is responsible for symptoms such as cramps, bloating, sore boobs, fatigue, moodiness, breakouts, diarrhea, nausea, headaches, irritability, mood swings, food cravings, anxiety, and more (fun, we know!). PMS symptoms often show up a few days before your flow begins and can function as helpful signs to let you know when to keep your period undies on hand!
Afterpay
With Afterpay, you can buy now and pay for your order in 4 equal payments made every two weeks — no interest added.
To be eligible for Afterpay, the value of your cart must be between $35 and $1,000. Gift cards are not eligible. Afterpay payments are due in 4 equal installments every two weeks, automatically processed to the card you register on file. The first installment is due at the time of purchase.After adding products to your cart, select Afterpay as your payment method at checkout. If this is your first time using Afterpay, you'll be redirected to their website to register and provide your payment details. If you've used Afterpay before, you'll log in to your account to complete your order.
You can use Afterpay toward any Thinx Inc. purchase of period and bladder leak underwear. Gift cards are not eligible.
Unfortunately, no — Afterpay is only available to customers in the US.
With Afterpay, you make your first payment at the time of purchase. The remaining amount due will be deducted automatically in three equal installments every two weeks from the payment method you've set up. If you want to make a payment before your next installment is due, log in to your Afterpay account — any remaining amount still owed will be updated accordingly.
Late fees may apply if you cannot make a payment. Take a look at Afterpay's complete terms and conditions for more details.
Afterpay orders are processed just like any other US standard shipping order. Once confirmed, orders typically ship out in about 1-2 business days. US standard shipping should arrive within 5-7 business days. For more information, check out our shipping details.
Afterpay will determine your spending limit and can approve or deny purchases based on payment history.
You can also use a gift card with Afterpay to pay for your purchase.
All Thinx Inc. underwear and apparel are eligible for purchase using Afterpay at checkout. Thinx Inc. gift cards are not eligible.
We offer a 45-day money-back guarantee on all purchases, including Afterpay. In this case, the original form of payment, Afterpay, is refunded. When you return item/s from an order, Afterpay will deduct the item amounts from the purchase total and adjust any remaining installments accordingly. In the case of complete order returns, Afterpay will refund any payments already made towards the total purchase and change any remaining installments to $0.
Visit Afterpay for additional information and answers to your questions.
With Afterpay, you can buy now and pay for your order in 4 equal payments made every two weeks — no interest added.
To be eligible for Afterpay, the value of your cart must be between $35 and $1,000. Gift cards are not eligible. Afterpay payments are due in 4 equal installments every two weeks, automatically processed to the card you register on file. The first installment is due at the time of purchase.After adding products to your cart, select Afterpay as your payment method at checkout. If this is your first time using Afterpay, you'll be redirected to their website to register and provide your payment details. If you've used Afterpay before, you'll log in to your account to complete your order.
You can use Afterpay toward any Thinx Inc. purchase of period and bladder leak underwear. Gift cards are not eligible.
Unfortunately, no — Afterpay is only available to customers in the US.
With Afterpay, you make your first payment at the time of purchase. The remaining amount due will be deducted automatically in three equal installments every two weeks from the payment method you've set up. If you want to make a payment before your next installment is due, log in to your Afterpay account — any remaining amount still owed will be updated accordingly.
Late fees may apply if you cannot make a payment. Take a look at Afterpay's complete terms and conditions for more details.
Afterpay orders are processed just like any other US standard shipping order. Once confirmed, orders typically ship out in about 1-2 business days. US standard shipping should arrive within 5-7 business days. For more information, check out our shipping details.
Afterpay will determine your spending limit and can approve or deny purchases based on payment history.
You can also use a gift card with Afterpay to pay for your purchase.
All Thinx Inc. underwear and apparel are eligible for purchase using Afterpay at checkout. Thinx Inc. gift cards are not eligible.
We offer a 45-day money-back guarantee on all purchases, including Afterpay. In this case, the original form of payment, Afterpay, is refunded. When you return item/s from an order, Afterpay will deduct the item amounts from the purchase total and adjust any remaining installments accordingly. In the case of complete order returns, Afterpay will refund any payments already made towards the total purchase and change any remaining installments to $0.
Visit Afterpay for additional information and answers to your questions.
Give $10, get $10
Our referral program is one way for you to spread the Thinx Inc. love! If you refer a friend, they get $10 to spend on any Thinx Inc. product (Thinx for All Leaks, Thinx, or Thinx Teens). If they make a purchase, you also get $10 in credits. You can earn up to $500 in Thinx inc. credit by referring up to 50 friends. To get started, sign up or log in to your account. Share your unique referral link directly or through email, SMS, WhatsApp, or Facebook!
If you’re referring a friend, your $10 in credits are unlocked in one week (after they make a purchase) as long as the order isn't canceled. If you're a new customer referred by a friend, you can use your referral code immediately to get $10 off your first order of $35 or more.
With each referral, you earn ten credits, which is the equivalent of $10! One credit = $1.
For every new customer, you refer, you will earn a $10 credit to apply toward any Thinx Inc. purchase (Thinx for All Leaks, Thinx, or Thinx Teens). So, if you refer three new customers, you'll have $30 to spend. You can use your credits all at once or split your credits across orders until you use all credits.
Yes — you can earn up to $500 in Thinx inc. credit by referring up to 50 friends. After that, your friends who are new customers will keep receiving $10 promo codes but you will not accrue any more credits on your account.
You can only refer new customers.
No, you can refer as many people as you want, so refer away!
Unfortunately, if your referral cancels their order, you won’t receive the $10 credit.
If you are the referrer, you can stack your referral credits with up to one discount code and use an unlimited amount of gift cards. If you are the referee, your code is not stackable with other promo codes.
Yep! At checkout, you can decide how many credits you want to apply to your order. You can apply them all at once or just use some of them and save the rest for later.
Yes! You can use credits toward any Thinx Inc. product (Thinx for All Leaks, Thinx, or Thinx Teens), including merch!
Our third-party partner, FriendBuy, which enables our referral program, is accepted in most countries, except for Ivory Coast, Togo, Ghana, Nigeria, China, Hong Kong, Philippines, and Russia — where FriendBuy is blocked. If you reside in one of these countries, you are unfortunately ineligible to refer or be referred by others. We're sorry about the inconvenience!
No, credits are calculated in USD and not converted to other currencies due to limitations with our partner, FriendBuy. If you select your local currency from the currency dropdown, the prices onsite will be reflected in that currency, but your credits will be USD.
No, credits don’t expire!
Our referral program is one way for you to spread the Thinx Inc. love! If you refer a friend, they get $10 to spend on any Thinx Inc. product (Thinx for All Leaks, Thinx, or Thinx Teens). If they make a purchase, you also get $10 in credits. You can earn up to $500 in Thinx inc. credit by referring up to 50 friends. To get started, sign up or log in to your account. Share your unique referral link directly or through email, SMS, WhatsApp, or Facebook!
If you’re referring a friend, your $10 in credits are unlocked in one week (after they make a purchase) as long as the order isn't canceled. If you're a new customer referred by a friend, you can use your referral code immediately to get $10 off your first order of $35 or more.
With each referral, you earn ten credits, which is the equivalent of $10! One credit = $1.
For every new customer, you refer, you will earn a $10 credit to apply toward any Thinx Inc. purchase (Thinx for All Leaks, Thinx, or Thinx Teens). So, if you refer three new customers, you'll have $30 to spend. You can use your credits all at once or split your credits across orders until you use all credits.
Yes — you can earn up to $500 in Thinx inc. credit by referring up to 50 friends. After that, your friends who are new customers will keep receiving $10 promo codes but you will not accrue any more credits on your account.
You can only refer new customers.
No, you can refer as many people as you want, so refer away!
Unfortunately, if your referral cancels their order, you won’t receive the $10 credit.
If you are the referrer, you can stack your referral credits with up to one discount code and use an unlimited amount of gift cards. If you are the referee, your code is not stackable with other promo codes.
Yep! At checkout, you can decide how many credits you want to apply to your order. You can apply them all at once or just use some of them and save the rest for later.
Yes! You can use credits toward any Thinx Inc. product (Thinx for All Leaks, Thinx, or Thinx Teens), including merch!
Our third-party partner, FriendBuy, which enables our referral program, is accepted in most countries, except for Ivory Coast, Togo, Ghana, Nigeria, China, Hong Kong, Philippines, and Russia — where FriendBuy is blocked. If you reside in one of these countries, you are unfortunately ineligible to refer or be referred by others. We're sorry about the inconvenience!
No, credits are calculated in USD and not converted to other currencies due to limitations with our partner, FriendBuy. If you select your local currency from the currency dropdown, the prices onsite will be reflected in that currency, but your credits will be USD.
No, credits don’t expire!
partnership
Thanks for your interest in selling our products! Unfortunately, we’re not accepting any new wholesale accounts at this time. To be notified, should anything change in the future, fill out our wholesale inquiry form.
Yes, we have both! To partner with us, apply with our Thinx Affiliate Program via Pepperjam. Affiliates are mainly self-sufficient and promote Thinx on their platforms, with minimal effort to participate. If you love talking about Thinx and all things menstruation as much as we do, join our community by becoming a Thinx Leader! Leaders are engaged members of our community and true advocates of our brand who use their platforms and resources for content creation and have a two-way relationship with the Thinx team.
Leaders are our most dedicated Thinx users and community members who are committed to sharing the innovation of Thinx, Inc. They’re content creators, community leaders, taboo busters, moms, eco warriors, healthcare professionals, and students, preferably with an online presence. If not, we’d love to hear about your offline communities, too!
Leaders receive personalized links to share with their audience across social media channels when they participate in Leader Program campaigns — we will provide social media guidelines and an onboarding kit once you join!
To get started, visit our Leaders Page and fill out your details. Someone on our team will reach out to share more about the program with you and take it from there.
All Leaders make commission on every order that comes in through them. The $$$ is a sliding scale, depending on your sales volume.
Nothing!
Nope! We will send you samples if you request. We suggest sending all your prospective buyers to your personalized URL.
We don’t dictate how often you post. You can post about us as much as you’d like on your schedule! We suggest at least one post per month, preferably on Instagram Stories (or other linkable content forms, like a Youtube video or blog post), so that your audience is familiar with the Thinx brand.
You can turn this opportunity into a side hustle! Some Leaders make a hundred dollars a month, while some Leaders make 10x that or more. It depends on what you put out and how often.
Thanks for your interest in selling our products! Unfortunately, we’re not accepting any new wholesale accounts at this time. To be notified, should anything change in the future, fill out our wholesale inquiry form.
Yes, we have both! To partner with us, apply with our Thinx Affiliate Program via Pepperjam. Affiliates are mainly self-sufficient and promote Thinx on their platforms, with minimal effort to participate. If you love talking about Thinx and all things menstruation as much as we do, join our community by becoming a Thinx Leader! Leaders are engaged members of our community and true advocates of our brand who use their platforms and resources for content creation and have a two-way relationship with the Thinx team.
Leaders are our most dedicated Thinx users and community members who are committed to sharing the innovation of Thinx, Inc. They’re content creators, community leaders, taboo busters, moms, eco warriors, healthcare professionals, and students, preferably with an online presence. If not, we’d love to hear about your offline communities, too!
Leaders receive personalized links to share with their audience across social media channels when they participate in Leader Program campaigns — we will provide social media guidelines and an onboarding kit once you join!
To get started, visit our Leaders Page and fill out your details. Someone on our team will reach out to share more about the program with you and take it from there.
All Leaders make commission on every order that comes in through them. The $$$ is a sliding scale, depending on your sales volume.
Nothing!
Nope! We will send you samples if you request. We suggest sending all your prospective buyers to your personalized URL.
We don’t dictate how often you post. You can post about us as much as you’d like on your schedule! We suggest at least one post per month, preferably on Instagram Stories (or other linkable content forms, like a Youtube video or blog post), so that your audience is familiar with the Thinx brand.
You can turn this opportunity into a side hustle! Some Leaders make a hundred dollars a month, while some Leaders make 10x that or more. It depends on what you put out and how often.
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Can’t find what you are looking for or have more questions?