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).
buy 3, save 10%
Buy 3-4 pairs for 10% off
Buy 5-6 pairs for 15% off
Buy 7+ pairs for 20% off
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
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
outer body: 96% modal, 4% elastane
inner body: 95% cotton, 5% elastane
gusset 1 (wicking): 100% polyester
gusset 2 (absorbent): 100% polyester
gusset 3 (barrier): 100% polyester, coated w/ breathable PU
polyester, polyurethane, Agion®, Lava XL-N®
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!
Apparel
Our apparel offers built-in period protection, so leaks & stains won't have to get in the way of you doing your thing.
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!
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 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.
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.
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 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.
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 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.
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.
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 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.
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.
