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Thinx underwear that absorbs your periodThinx Teens period underwear for teensThinx for All by Thinx underwear for bladder leaks

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Cassandra is 5'6" , hip size 37", wearing a size M

Thinx - Cotton Bikini - Black - Front
Thinx - Cotton Bikini - Black - Side
Thinx - Cotton Bikini - Black - Back
Thinx - Cotton Bikini - Black - Gusset

Modal Cotton

Final Sale 50% off

Modal Cotton Bikini

Original Price

$35

Sale Price

$17.50

Thinx underwear is not made or treated with PFAS

use shift + up or down to rotate image

Cassandra is 5'6" , hip size 37", wearing a size M

Thinx - Cotton Bikini - Black - Front
Thinx - Cotton Bikini - Black - Side
Thinx - Cotton Bikini - Black - Back
Thinx - Cotton Bikini - Black - Gusset

Thinx underwear is not made or treated with PFAS

absorbency moderate

3 out 5 droplets
holds3
worth.
colorBlack

 - final sale*

Select a color

size

size chart

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).

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).

*final sale items are not eligible for returns or exchanges.

style

A comfy, everyday bikini silhouette made from eco-friendly Modal Cotton, for leak protection that's breathable & buttery-soft.

Thinx underwear is not made or treated with PFAS.

fit

This style has a slightly higher cut leg and an extended gusset for extra coverage. It runs true to size, so we recommend ordering your usual size.

Thinx - Cotton Bikini - Style+Fit.jpg
Wear this style on moderate flow days for a feel that's just as comfy & cozy as your favorite sweatpants.

fabric

  • body/liner: 53% SUPIMA® Cotton, 35% TENCEL™ Modal, 12% elastane
  • gusset 1 (wicking): 95% cotton, 5% elastane
  • gusset 2 (absorbent): 96% cotton, 4% elastane
  • gusset 3 (barrier): 100% polyester, coated w/ breathable PU
  • SUPIMA® Cotton, elastane, polyester, polyurethane, Nanotex® wicking agent, Agion®
  • Thinx underwear is not made or treated with PFAS.

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 Modal Cotton illustration

Modal Cotton

Our buttery-soft Modal Cotton blend of SUPIMA®️ Cotton and TENCEL™ Modal is perfect for feeling *extra* cozy on your period.

Basically the most comfortable underwear I own. So breathable, and they really feel dry even after a whole day.
Bea from Charlotte, NC, very light to medium

how our period underwear works

Thinx - PDP - take the Know Your Flow quiz

find your style

Tell us a li'l bit about your flow, and we'll match you with the right pair!

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Mix and match any Thinx undies — and you can save up to 20%.

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