The Free-To-Flow Period Underwear

Soft, reusable period underwear that hold up to 3 regular tampons worth of liquid–cycle after cycle. Made without toxic chemicals, PFAS, or azo dyes.

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With every purchase you make, Cora provides period products and body literacy resources to people who might otherwise go without.

Hear From Our Cora Community

I have never felt so clean. Pads + period underwear has me so comfortable I almost forget I'm on my period. Life changing.


The fabric feels really soft and the style is super cute—it just looks like normal bikini underwear. I can barely feel it when I'm wearing it.


These are, hands down, the BEST I own. No other brand I have wicks away the moisture like these.I just came on here to order 5 more pairs.

Jennifer W

Frequently Asked Questions

How much blood does your Period Underwear absorb?

Our Period Underwear absorbs about 25 mL (roughly the amount held by 3-4 regular tampons) of menstrual fluid. However, absorption is affected by many things, including your menstrual flow, position (sitting, standing, moving), and activity. 

When should I wear Period Underwear?

Our Period Underwear can be worn as a replacement for your standard underwear. The absorbent gusset in our underwear provides protection against leaks, similar to a pad or liner. You can choose to wear Period Underwear as back-up protection with other period care products (tampons, cup, pad, etc.) or wear the underwear alone. You can wear Period Underwear during the day, overnight, or while being active. Some start by using Period Underwear as a replacement for a liner on the first or last days of your period. If you have a very irregular or unpredictable period, you might choose to wear them daily!

I’ve heard that some garments and textiles contain PFAS. Does your period underwear contain PFAS?

Cora period underwear is made without PFAS and is Standard 100 certified by Oeko-Tex. We also test each lot using an independent, accredited third party lab in the USA. The test showed that there are no PFAS/PFOA compounds at any detectable level.

How does the gusset in Period Underwear work?

Each pair of underwear has a “gusset” with a four-layer absorbent core designed to pull up to three tampons’ worth of liquid away from the body and create secure leak protection. On a pair of medium-sized period underwear, this gusset spans the panel of fabric between the legs and approximately 2.5” additional inches up the back. It's made from 91% polyester and 9% elastane. It's similar to fleece and highly absorbent. 

What people are saying

Cora’s got you covered, however you flow.

Check out our other goods.

Get To Know Your Period Underwear

When To Use
  • Depending on your flow, wear solo or as a backup to your tampon, cup or disc.
  • Comfortable and effective during sleep – for a restful night when you need it most.
  • Coverage that’s flexible and moves with your body – to fit easily into your active lifestyle.

For more detailed information about Cora Period Underwear, please visit our Period Underwear Resource Page.

Size Guide

Since our underwear is a bikini style, we recommend basing your size on your hip measurements, which should be taken across the widest part of your hips/butt. If you're unsure between two sizes, we recommend sizing up, or contact us here if you need help.

SizeWaistHipUS Size
XS24" - 25"
35" - 36"
S26" - 27"
37" - 38"
M28" - 29"
39" - 40"
L30" - 31.5"
41" - 42.5"
XL32" - 33.5"
43" - 44.5"
XXL34" - 36"45" - 47"18-20
How To Wash

Follow these steps to help your period underwear last without sacrificing comfort or absorbency.

  • Rinse in cold water 
  • Machine wash on delicate cycle
  • Line dry or lay flat

Good for Your Period. And the Planet.

Listen to what our Cora Community has to say about our Period Underwear.

From Day-to-Night


  • Holds up to 3 tampons while you do your daily activities 
  • Bikini style
  • Perfect to pair with a cup, disc, or tampon
  • For moderate days


  • Holds up to 6 tampons while you catch some zzz's 
  • High-waisted fit
  • Up to 10 hours of leak protection
  • For heavy nights

Read More at Blood & Milk

Blood + Milk is a community and resource for the awakening woman.