How It Works

Be the Boss of your Period.

We created KT Period Underwear because we believe periods shouldn’t stop teens from doing awesome stuff. Get 100% period-proof protection and stay comfortable & confident for your whole cycle. Whether you’re bringing your period to school, the big soccer game, the movies, or a sleepover – bring us too.

Shop Now

What are KT by Knix period panties?

KT Period-Proof Underwear prevent embarrassing leaks and keep teens feeling fresh, comfortable & confident on their periods. They can be used as back-up protection or as a total replacement for disposable pads, tampons, and panty liners.

How does KT by Knix period underwear work?

KT Period-Proof Underwear has built-in, absorbent liner with Patented Leak-Proof Technology that absorbs liquid and stops leaks.

What do other reviews say about KT by Knix period underwear?

We don’t like to sing our own praises… so we let these real teens and tweens do it for us!

Can KT by Knix period underwear replace pads?

Totally! KT Period Underwear hold between 2-12 teaspoons of liquid depending on the style (that's 2-12 tampons worth of blood!). You can wear Super Leakproof Underwear on heavier days and Leakproof Underwear on lighter days or as back up protection, and our Super Sleepover Short has you covered at night!

Can I only wear my KT by Knix underwear when I’m on my period?

You can wear your KT Period Underwear 24/7 if you want to! They are seamless, sweat-wicking and odor-crushing. That means they're great under leggings to avoid panty lines or at they gym to avoid getting too sweaty down there. Plus, they're so cute & comfy!

Can you swim in KT by Knix period panties?

Check out KT Period-Proof Swimwear

Does it feel like you’re sitting in a puddle?

Not at all! In fact, many teens have said they feel more dry wearing KT Period Underwear than they do wearing regular disposable pads. This is thanks to our quick-drying and moisture-wicking technology!

What size do I get?

KT by Knix is in junior sizing and designed for teens and tweens to fit their growing bodies. Everyone’s body is different, so refer to the Teen Underwear Size Chart to find the best fit. If you’re not a teen, but you’re loving the idea of added protection for leaks, check out our adult brand, Knix!

How do you wash KT by Knix Period Panties?

This is the best part, you can wash you KT Period Underwear with your regular clothes! Just machine-wash cold and tumble dry low. For regular Leakproof Underwear, we recommend laying flat to dry. And don’t worry about blood getting on your other clothes in the wash, they’ll be just fine. But if you want, you can give your KT Underwear a quick rinse in the sink before you throw them in the wash.

Are KT by Knix period panties safe?

Super safe! Our Period-Proof Underwear is 100% hygienic and made to be up close and personal with the most sensitive areas of your body.

What is KT by Knix period underwear made from?

The body of our undies is made from 77% nylon and 23% LYCRA®. The gusset liner (the piece of fabric between your leg openings) is made from 86% cotton, 10% spandex and 4% carbon. Our gusset features Patented Leak-Proof Technology™ to keep you fresh and leak-free!

How do I return them?

We have a First Pair Risk-Free Return Policy for your first order - no ifs ands or buts! So if you ordered the wrong size of Period Underwear, we’ll send you a different pair at no cost or offer you a standard refund within 30 days of delivery (excluding original shipping fees).

If your first order included multiple Period Underwear: OPEN, WASH & WEAR ONE PAIR ONLY to be sure you love them. That way if you don’t, any unopened packages from the same purchase are also eligible for an exchange or standard refund (excluding original shipping fees).  

All unopened packages will be donated to local organizations to support people in need. 

Where do you sell them?

Our product is available exclusively online at or

How does KT Period-Proof Swimwear work?

Our Swimwear features the same Patented Leak-Proof Technology as our Period-Proof Underwear with an additional thin layer of waterproof material for extra protection.

How much liquid do they hold?

KT Swimwear has a super discreet absorbent pad in the gusset liner that absorbs up to 3 tsps of blood, which equals about 3 tampons or 1-2 regular pads.

Do I need to wear a pad or tampon with KT Period-Proof Swimwear?

Nope. Every period is different though, and we recommend doing whatever makes you feel most confident. KT Swimwear can be worn alone without any additional period protection or used as backup protection on super heavy days with a tampon or menstrual cup.

How do I wash the KT Swimwear?

Just machine-wash cold and lay flat to dry. Do not bleach.

Is it chlorine safe?

Definitely. KT Swimwear is seawater and chlorine resistant and has 50+ SPF protection!

Can I return the swim if it does not fit?

Yes. As long as the sanitary strip and tag is still attached.

Can I wear these when I don’t have my period?

Absolutely. KT Swimwear looks and feels just like regular swimwear with a barely-there leak-proof liner.