Period Proof Underwear

See Our Period Undies in Action

Watch our Leak-Loc® technology absorb up to 10 tsp of liquid.

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Really (Really) Comfy

Rest assured you will be covered and seriously comfy everyday.

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Really (Really) Covered

Mix and match styles and save 30%.

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Really (Really) Easy care

Caring for your proof undies is simple. Just machine wash and hang to dry.

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Top FAQs

Proof leakproof undies are constructed with our patented Leak-Loc® technology which helps absorb liquid and wicks away moisture to help you feel dry and comfy.

Heavy periods have met their match. Proof period undies were designed to handle even the heaviest of flows.

The Hipster is a super heavy period's BFF. Equipped with a super-absorbent core that holds up to 5 regular tampons or 10 tsp and front-to-back protection so you're covered, even overnight! Other heavy flow MVPs: The Bikini and The Mesh Hipster handle that time of the month like a boss.

In a word, yes!

Proof period undies were designed to replace pads and replace or backup tampons and cups. Simply choose an absorbency level based on your typical flow, or how many tampons you use in an average day on your period.

We use a unique combination of super-absorbent materials that pull in moisture and absorb liquid, helping to keep you dry and confident. Our Leak-Loc® edges ensure that drips stay in the Proof - and not on your pants. Our super heavy styles hold 5 tampons or 10 teaspoons of liquid, and have been able to lock in even the heaviest flows!

If you're unsure about switching to Proof completely, you may feel more comfortable using Proof undies as a back-up for your menstrual cup or tampon, and then gradually making the switch.

Washing Proof period underwear is easy! Proof undies feature strong protection, but should be washed gently. Simply toss in the washing machine on a delicate cycle, using cold water and mild detergents. Hang or lay flat to dry. No washing machine? Hand washing in cold water with a gentle detergent works great, too!

More helpful tips to care for your pair:

-Don’t wring or twist your undies

- be gentle when washing Proof

-Hot water, harsh detergents, and bleach can damage the absorbent technology in Proof undies, so be sure to use cold water and mild detergent

-Hang or lay flat to dry - do not put in the dryer

-Proof undies have a super absorbent core that can take between 6 and 24 hours to dry. Heavier absorbency pairs have more layers of absorbent material, and will take longer to dry than our light pairs. To expedite the drying process, blot away excess moisture from the gusset before laying flat or hanging to dry.

-Want a refresh? To make your period undies fresh and remove any lingering odor, use a few drops of vinegar or tea tree oil during the rinse cycle of your wash - voila! So fresh and so clean.

Quick answer? A lot.

Proof underwear are a reusable alternative to single-use plastic disposables like pantyliners, pads, and tampons. Additionally, they are safer than tampons - as Proof undies are not an internal use product - and will not cause Toxic Shock Syndrome. We use only the highest quality materials when constructing our underwear - so you’re covered and comfortable, all day.

Ohhh yeah. Our lighter absorbency pairs are excellent for every day wear, when you don’t need a higher absorbency to hold your flow, but any pair of Proof will give you peace of mind every day of the month. We recommend The Everyday Undie for every day of the week - smooth, seamless edges disappear beneath clothing, and a super slim lining absorbs discharge, sweat, and spotting to help keep you secure and confident.

Please do! We designed Proof period underwear in a wide range of absorbencies to suit any flow, from spotting to super heavy periods. To find your absorbency level, gauge your flow based on typical tampon usage on an average day. Helpful tip: Remember, many women change tampons before they are entirely saturated - and our guide is based on tampons used to their saturation point.

Most Proof users find they can wear our period underwear for 12+ hours before changing. In other words, when you find the absorbency level that suits your flow, you can wear them as you would a normal pair of undies - one pair during the day, and one pair at night - without having to change.

If you’re unsure of your absorbency level, or worry that Proof can’t handle your flow (trust us - it can!), you may want to consider wearing Proof as a backup for your tampon or cup before switching completely. Consider it the ‘dating’ phase of period underwear. We’re pretty sure you’ll be going steady in no time at all.

Proof uses a proprietary combination of moisture wicking linings, absorbent fabric, and leakproof materials to create the world’s best period panties. Our Quik-Wick lining pulls moisture away from the body and into the super absorbent core. Within our absorbent core we use several layers of Drop-Stop fabric depending on the absorbency, which fights odor, absorbs liquid, and inhibits the growth of bacteria. These layers are backed up with several layers of unique leakproof material, which keeps your period in the Proof - not on your pants! To learn more about how Proof period undies work, keep reading here.




Super Absorbent


fights odor


and comfy