Period Proof Underwear

With a pair for every flow, you’ll be able to find your proof-perfect fit.

Rated 5.0 out of 5
Based on 22 reviews
Leakproof Thong
$25
Holds up to 1 Regular Tampon or 2 Teaspoons

Eliminate panty lines and light leaks


Rated 4.8 out of 5
Based on 21 reviews
Leakproof Brief
$35
Holds up to 3 Regular Tampons or 6 Teaspoons

A classic silhouette with discreet leak protection


Rated 4.9 out of 5
Based on 18 reviews
Leakproof Lace Cheeky
$37
Holds up to 3 Regular Tampons or 6 Teaspoons

Cheeky style with built-in leak protection


Rated 4.8 out of 5
Based on 19 reviews
Leakproof Bikini Underwear
$39
Holds up to 4 Regular Tampons or 8 Teaspoons

Basic made better, protection from all kinds of leaks


4 Different Absorbency Levels

Rated 4.9 out of 5
Based on 15 reviews
Mesh Hipster Leakproof Underwear
$39
Holds up to 4 Regular Tampons or 8 Teaspoons

Super absorbent and powerful leak protection


Rated 4.8 out of 5
Based on 24 reviews
Leakproof Hipster Underwear
$43
Holds up to 5 Regular Tampons or 10 Teaspoons

The ultimate in leak protection


Period Proof Underwear

Underwear that holds up to 5 tampons, designed for that time of the month. From light to super heavy, there's a pair for every phase of your flow. Use Proof leakproof panties as a replacement for tampons and pads, or back up your tampon or menstrual cup for maximum period protection.

Tell tampons to shove it

Meticulously designed period proof underwear that keeps you covered on light days or during a very heavy flow. Plus, when you switch to reusable Proof undies, you're helping to keep single-use plastic products out of landfills (how's that for a win-win?!)

Top FAQs

see all FAQS

Will period underwear smell?

Proof leakproof undies are constructed with unique antimicrobial fibers that reduce odor and inhibit the growth of bacteria, to help you feel fresh and dry.

Help! I have a super heavy flow - what period underwear is best for a heavy period?

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.

Can Proof period undies replace pads and tampons? Can I use it with a cup?

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.

How do I wash Proof period underwear?

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.

What makes Proof period underwear different from other period products?

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.

Can I use Proof period proof undies every 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.

Is period underwear safe?

Proof period underwear are one of the most safe period products available. Proof is an external use product, meaning it does not go in the body, like a tampon would. Internal use products like tampons carry the risk of Toxic Shock Syndrome, a rare but serious condition caused by bacterial toxins. Proof period panties remain outside of the body, which decreases the risk of harmful bacterial growth in the body.

What’s more, Proof is designed with high quality materials that have been rigorously tested to ensure your safety. Proof period undies are free of PFOA-PFOs, lead, phthalates, and other harmful chemicals. Our leakproof pairs feature antimicrobial fibers that not only fight odor, but inhibit the growth of bacteria to help keep you healthy and fresh.

Our leakproof technology is woven in - not sprayed on the top lining, like other period undies - so it will never wash out or reabsorb into the body. We are dedicated to providing you with the highest quality care - down there.

Can you wear period underwear all day?

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.

How do period panties work?

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.

Go with your flow

We've designed period underwear for every phase of your flow, from surprise light spotting in-between periods to super heavy periods and beyond.

Leak Free Underwear

With a pair for every flow, you’ll be able to find your proof-perfect fit.