Savings are applied automatically during checkout. Our custom set discount applies to Thinx period underwear and Speax bladder leak underwear (but excludes Sale items and Saver Sets).
Buy 4-5 pairs for 10% off
Buy 6-7 pairs for 15% off
Buy 8+ pairs for 20% off
Savings are applied automatically during checkout. Our custom set discount applies to Thinx period underwear and Speax bladder leak underwear (but excludes Sale items and Saver Sets).
style
These comfy, boxer-inspired pajama shorts are equipped with our highest absorbency for overnight protection.
fit
This style features built-in bikini underwear with an extended gusset for extra front-to-back coverage. It fits true to size, so we recommend ordering your usual size.
Perfect to sleep in (or just lounge in) to prevent leaks on your heaviest days. They even have pockets!
fabric
short: 96% micro modal, 4% spandex
bikini: 95% cotton, 5% spandex
gusset 1 (wicking): 100% polyester
gusset 2 (absorbent): 100% polyester
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
To take care of your Thinx, give ‘em a spin in the washing machine on cold (just no softener or bleach!), and hang dry. Do not iron!
No more bulky overnight pads for me! I can just sleep and not worry about waking up to period stains.
Beatriz R. from Lowell, MA, moderate to 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!
Customers rate Average Fit as being: between runs small and true to size
Days Worn On
light
moderate
heavy
Customers rate Days Worn On as being: between moderate and heavy
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FAQs
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 $$$.
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.
Thinx is super simple to care for; toss them in with the rest of your laundry in a cold wash cycle. Your other clothes will be fine, we promise! Just make sure you steer clear of fabric softener and bleach! And last but not least, hang dry your undies.
It takes 24-48 hours for your return to be processed. After that, your order ships back out to you immediately!
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 $$$.
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.
Thinx is super simple to care for; toss them in with the rest of your laundry in a cold wash cycle. Your other clothes will be fine, we promise! Just make sure you steer clear of fabric softener and bleach! And last but not least, hang dry your undies.
It takes 24-48 hours for your return to be processed. After that, your order ships back out to you immediately!
