frequently asked questions

Our underwear for periods absorbs your flow, helps control odor, wicks moisture, and helps prevent leaks — so you feel fresh, dry, and comfortable throughout the day!

No other period products are required. Our period-absorbing underwear is machine washable and reusable— so you can wear, wash, and wear again!

Yep. Our period underwear is washable and reusable, so you can wear it, wash it, and wear it again, just like regular underwear.

Follow our care instructions to keep your undies in tip-top shape.

Our newest period-absorbing underwear styles hold up to 12 regular tampons' worth of flow and are leakproof all day up to 12 hours. No other period products are needed.

Our newest period-absorbing underwear features our signature, innovative built-in absorbent technology within the gusset of the underwear — a moisture-wicking top layer, an ultra-absorbent core layer, and our LeakSafe™ barrier that leaves you feeling fresh and dry.

Wash your period underwear before wearing them. Machine wash with like colors on cold, line dry, and repeat. Do not iron, bleach, or dry clean. Replace your Thinx at 30 washes. Visit our How to Wash page for more details.

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.

See fabric & materials for information specific to each style.

Our underwear is not made or treated with PFAS.

Thinx for All Leaks are machine-washable, reusable underwear designed to replace single-use disposables. They come in discreet designs that look and feel like regular underwear.

Just wear, wash, and reuse them again and again. They absorb leaks, control odors, and wick away moisture — so you can stay fresh and dry no matter what.

They sure are! Thinx for All Leaks is washable and reusable so that you can wear, wash, and wear again, just like regular underwear. Leaks shouldn't disrupt your lifestyle — you can finally ditch inconvenient and uncomfortable pantyliners for good.

Our bladder leak-absorbing underwear holds up to 100 mL (holds up to 6
tablespoons, 16.5 pantyliners, or 5.5 regular pads worth) for protection from light bladder leaks.

Our bladder leak-absorbing underwear features our signature, innovative built-in absorbent technology within the gusset of the underwear — a moisture-wicking top layer, an ultra-absorbent core layer, and a moisture-impermeable layer that leaves you feeling fresh and dry.

Wash cold before first wear, then after each use with the rest of your clothes.

Skip the bleach + fabric softener! Tumble dry low or hang them up. Replace Thinx for All Leaks bladder leaks undies at 30 washes.

We recommend following the hip measurement to find the most accurate size. Be sure to measure your hips at their widest point, derrière included! Thinx for All Leaks runs true to size but has a bit of natural stretch.

If you're in between sizes, we recommend sizing down. Take your regular size for a flex fit postpartum.

Our bladder leak underwear is comprised of stretchy, comfy fabrics like polyamide, polyester, and elastane that help protect you from leaks.

Our underwear for periods absorbs your flow, helps control odor, wicks moisture, and helps prevent leaks — so teens feel fresh, dry, and comfortable throughout the day!

No other period products are required. Our period-absorbing underwear is machine washable and reusable— so you can wear, wash, and wear again!

Yep. Our Thinx Teens period underwear is washable and reusable, so teens can wear them, wash them, and wear them again, just like regular underwear.

Follow our care instructions to keep your teens' undies in tip-top shape.

Our newest Thinx Teens period-absorbing underwear styles absorb up to 12 regular tampons (or 3 regular pads') worth of flow.

They offer all-day, leakproof protection for up to 12 hours to support early and inconsistent teen periods. No other period products are needed.

Our newest period-absorbing underwear features our signature, innovative built-in absorbent technology within the gusset of the underwear — a moisture-wicking top layer, an ultra-absorbent core layer, and an outermost LeakSafe™ barrier that leaves teens feeling fresh and dry.

Wash your teens' period underwear before they wear them.

Machine wash with like colors on cold, line dry, and repeat. Do not iron, bleach, or dry clean. Replace Thinx Teens at 30 washes. Visit our How to Wash page for more details.

Thinx Teens™ fits true to size and is available in standard youth sizes 9-10 (S) through 15-16 (XL). Thinx Teens™ is specifically designed to fit teens and is narrower around the thigh. We recommend following the hip measurement to find the most accurate size for your teen. Be sure to measure your teens' hips at their widest point, derrière included!

See fabric & materials for information specific to each style.

Our underwear is not made or treated with PFAS.

Shop our site to deliver period and leak protection 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.

We accept nearly all local currencies for the countries we sell in. 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 of $99+.

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.

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.

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 in the U.S. and looking to exchange for a different underwear size/color or another style, you can do so through our online Returns Portal.

If you are outside the U.S., please contact our customer service team with your order number, exchange details (style, size, color), and shipping address, and we’ll process a manual exchange on your behalf.

Nope! Instead, we encourage you to pass unused and unopened pairs to a friend.

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.

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.

Body literacy is understanding the body and its functions, so that we can be more empowered when it comes to our health and wellness.

Without body literacy, there is a rise in misinformation, stigmas, and shame around our bodies and its normal functions.

At Thinx, we believe in challenging societal stigmas and giving more people access to body education. That’s why we created GetBodyWise.

Menstrual equity refers to equal and comprehensive access to menstrual hygiene products and the right to reproductive health education.

Thinx actively supports menstrual equity by offering educational content and partnering with like-minded organizations to bring leak protection products to communities that need them most.

Through our GetBodyWise program, we're working to fight societal stigmas and help empower more people with body literacy.

Thinx Inc. is another iconic brand under the Kimberly-Clark family of brands. Together our family of brands (Thinx, Thinx Teens™, and Thinx for All Leaks) is committed to empowering *every body* with innovative solutions and social change.

Thinx and Thinx Teens are washable, reusable period underwear. Our newest styles absorb up to 12 regular tampons for all-day leakproof protection for up to 12 hours. Each pair is moisture-wicking, ultra-absorbent, and leak-resistant.

Our teen period underwear is available in standard youth sizing to fit younger bodies and in full-coverage styles to support first and early periods. Thinx adult line is available in sizes up to 4X and in various underwear styles to meet your preferences.

Thinx and Thinx for All Leaks are reusable, absorbent underwear designed to replace disposable products. They absorb leaks, help control odors, and wick away moisture to help keep you dry and comfortable.

They look and feel like regular underwear, so you can wear them, wash them, and wear them again. Thinx absorbs period flow, while Thinx for All Leaks is underwear designed for light bladder 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 Thinx period underwear to protect against bladder leaks.

Our undies are machine washable, reusable, and absorbent — there's *a lot* of science and development that goes into making them and ensuring they last. Replace them at 30 washes as a reusable alternative to single-use period products.

Thinx underwear is safe. Per- and polyfluoroalkyl substances, also known as PFAS, are absolutely not part of our product design and we do not treat our finished products with PFAS. We also take measures to help ensure these substances are not added to our products through material, design, production, facility, and supplier controls.

We care deeply about the materials used in our products, putting comfort and safety at the core of our design, development and manufacturing.

You deserve period and bladder leak 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 for product safety through an accredited, globally recognized third-party laboratory to help ensure they are compliant with all laws and regulations.

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.

Our undies are machine washable, reusable, and absorbent — there's *a lot* of science and development that goes into making them and ensuring they last. Replace them at 30 washes as a reusable alternative to single-use period products.

Yes! We're always thinking up new styles, colors, and products. Be sure to subscribe to our email list to get the first peek at new products, surprise sales, clever blog posts, and even a chance to win a free pair of undies!

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.

Thanks for your interest in selling our products! Unfortunately, we’re not accepting any new wholesale accounts at this time.

You're in the right place if you want to work with an innovative, energized team that keeps growing.

Our team is one-of-a-kind, and we're always looking for people to join us and make a difference!