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).
*Final sale items are not eligible for returns or exchanges.
style
Our best-selling style — designed with ultra-thin micromesh to keep you cool, fresh, & dry on light to moderate flow days.
fit
This style has extra back coverage and fits true to size, so we recommend ordering your usual size.
This fabric is quick-drying and lightweight, making it perfect for travel & exercise and comfy enough to wear everyday.
fabric
body: 78% polyamide, 22% 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!
Thinx air™️
Feel light as air in our breathable, quick-drying micromesh fabric. Perfect for when you need a lil ventilation down there.
I have several pairs of Thinx and these are my favorite. They are super thin, light, and don't feel like I have anything special on. They’re cute and comfy.
Leslie from San Francisco, CA, light to moderate 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 air™ is period-absorbing underwear made with an ultra-thin, cooling, and sweat-wicking micromesh fabric that keeps you *extra* fresh and dry. (Pro tip: our undies are great for travel and sports!). Bonus: These hang dry 2x faster than our original undies — so, little downtime in-between washes. Learn more about Thinx air™️
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.
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.
Thinx air™ is period-absorbing underwear made with an ultra-thin, cooling, and sweat-wicking micromesh fabric that keeps you *extra* fresh and dry. (Pro tip: our undies are great for travel and sports!). Bonus: These hang dry 2x faster than our original undies — so, little downtime in-between washes. Learn more about Thinx air™️
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.
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.
