Savings are applied automatically during checkout. Our custom set discount applies to Thinx period underwear and Thinx for All Leaks bladder leak underwear (but excludes Saver Sets).
style
Our best-selling style of period undies — complete with a full-coverage fit and a comfy lace waistband.
fit
This style has extra back gusset coverage. The elastic fits snugly around the leg to protect from leaks, so if you're in between sizes, we recommend sizing up.
Wear this one on your moderate flow days for maximum coverage and comfort. Great for long work or travel days!
fabric
body: 84% polyamide, 16% elastane
body liner: 95% cotton, 5% elastane
gusset 1 (wicking): 95% cotton, 5% elastane
gusset 2 (absorbent): 96% cotton, 4% elastane
gusset 3 (barrier): 100% polyester, coated w/ breathable PU
Our underwear is certified according to STANDARD 100 by OEKO-TEX:registered: [20.HUS.04850 | HOHENSTEIN HTTI]
care instructions
Wash before wearing. Hand wash or machine wash cold on a delicate cycle. Do not use bleach or fabric softener. Hang dry — no ironing please!
Classic
Stylish silhouettes featuring seasonal colors and lace & mesh details in a silky-smooth fabric. Available in all 5 absorbencies for every type of flow.
I wear this to train in Brazilian jiu-jitsu, full contact! No way I’m going without the safety net of Thinx.
Katheryne from New York, NY, heavy flow
how our period underwear works
find your style
Tell us a li'l bit about your flow, and we'll match you with the right pair!
Thinx is machine-washable and reusable period-absorbing underwear — providing a more sustainable alternative to single-use disposable products. Thinx underwear for periods is designed in a range of absorbencies, from lightest to super, to support every stage of your flow. Every pair of Thinx period-absorbing underwear features our signature, innovative built-in technology — a moisture-wicking top layer, an absorbent core layer, and an outermost leak-resistant barrier. Check out our How Thinx Work page to learn more.
Our absorbency levels range from lightest (1 regular tampon worth of flow) to Super (5 regular tampons worth of flow), so there is a style for every day of your cycle. We recommend trying Thinx period-absorbing underwear for the first time at home so you can see how they best work for your ~flow~. If you feel damp or notice your flow spreading to the seams, it may be time to change into a new pair. We recommend starting with 3-5 undies, so you’ll be covered for your entire cycle without doing extra laundry. We offer Saver Sets and discounts when you buy 3+ pairs so you can build your collection and get more for less $$$.
Across all absorbencies, the gusset positioning within the underwear varies by style. However, generally, the gusset sits under the entire front of the vulva, widened significantly at the front and rear for leak protection and with extra length in the back — covering the surface area necessary to absorb your flow and prevent leaks.
Every flow is different! You can wear period-absorbing underwear for as long as your flow will allow. And of course, the style you wear also plays a factor, as some underwear styles are more absorbent than others. We measure our underwear for periods by absorbency, with our highest absorbency styles holding up to 5 tampons worth of flow. For some customers, they will last the whole day, and others may need to carry an extra pair of Thinx period underwear as a backup. If you feel damp or notice your flow spreading to the seams, that is an indicator you should change into a fresh pair. We suggest bringing along a resealable bag, pouch, or wet bag — so that if you do need to change out of your first pair of Thinx undies, you've got a place to put them. If you're unsure which styles to start with, we recommend taking our Know Your Flow quiz.
We recommend following the hip measurement to find the most accurate size. Be sure to measure your hips at their widest point, derriere included! We recommend sizing up in underwear styles that fit below the natural waist. Check the fit details of each underwear style via our size chart. The underwear should fit snugly but not so tight that it becomes uncomfortable.
Our underwear is super simple to care for: make sure to wash before your first wear and with the rest of your laundry after each use. Hand wash or machine wash cold on a delicate cycle. Your other clothes will be fine, we promise! Just make sure to steer clear of fabric softener and bleach. And, last but not least, hang dry to keep your undies at max performance. Do not iron.
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.
Thinx is machine-washable and reusable period-absorbing underwear — providing a more sustainable alternative to single-use disposable products. Thinx underwear for periods is designed in a range of absorbencies, from lightest to super, to support every stage of your flow. Every pair of Thinx period-absorbing underwear features our signature, innovative built-in technology — a moisture-wicking top layer, an absorbent core layer, and an outermost leak-resistant barrier. Check out our How Thinx Work page to learn more.
Our absorbency levels range from lightest (1 regular tampon worth of flow) to Super (5 regular tampons worth of flow), so there is a style for every day of your cycle. We recommend trying Thinx period-absorbing underwear for the first time at home so you can see how they best work for your ~flow~. If you feel damp or notice your flow spreading to the seams, it may be time to change into a new pair. We recommend starting with 3-5 undies, so you’ll be covered for your entire cycle without doing extra laundry. We offer Saver Sets and discounts when you buy 3+ pairs so you can build your collection and get more for less $$$.
Across all absorbencies, the gusset positioning within the underwear varies by style. However, generally, the gusset sits under the entire front of the vulva, widened significantly at the front and rear for leak protection and with extra length in the back — covering the surface area necessary to absorb your flow and prevent leaks.
Every flow is different! You can wear period-absorbing underwear for as long as your flow will allow. And of course, the style you wear also plays a factor, as some underwear styles are more absorbent than others. We measure our underwear for periods by absorbency, with our highest absorbency styles holding up to 5 tampons worth of flow. For some customers, they will last the whole day, and others may need to carry an extra pair of Thinx period underwear as a backup. If you feel damp or notice your flow spreading to the seams, that is an indicator you should change into a fresh pair. We suggest bringing along a resealable bag, pouch, or wet bag — so that if you do need to change out of your first pair of Thinx undies, you've got a place to put them. If you're unsure which styles to start with, we recommend taking our Know Your Flow quiz.
We recommend following the hip measurement to find the most accurate size. Be sure to measure your hips at their widest point, derriere included! We recommend sizing up in underwear styles that fit below the natural waist. Check the fit details of each underwear style via our size chart. The underwear should fit snugly but not so tight that it becomes uncomfortable.
Our underwear is super simple to care for: make sure to wash before your first wear and with the rest of your laundry after each use. Hand wash or machine wash cold on a delicate cycle. Your other clothes will be fine, we promise! Just make sure to steer clear of fabric softener and bleach. And, last but not least, hang dry to keep your undies at max performance. Do not iron.
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.
