Cotton Bikini

Original Price


absorbency moderate

holds 3worth.
Select a color


size chart

buy 4 and save 10%

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).


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


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.


  • body/liner: 53% SUPIMA cotton, 35% TENCEL modal, 5% elastane 16% 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

Hand wash or wash cold on a delicate cycle. Do not use bleach or fabric softener. Hang dry – no ironing please!

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

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

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Thinx - PDP - Promo - Create a Set 4/6/8

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Cotton Bikini

4.8 out of 5 stars

based on 99 reviews

Average Fit

Customers rate Average Fit as being: between true to size and runs big

Days Worn On

Customers rate Days Worn On as being: between light and moderate

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    size purchased

    period management

    days mostly worn on

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