Period Swimwear

The last place you want to worry about leaks is on the beach or by the pool. These Leakproof suits keep you worry-free thanks to our proprietary leakproof technology. Maximum protection, no tampon required.

Dependable On Their Own, or as a Backup

We want you to feel complete confidence, so it’s your choice: Period-proof swimwear is made to hold menstrual fluid and prevent leaks in the water. You can depend on it to hold 3 teaspoons (or 2 tampons worth) of menstrual blood. Or wear it as a backup with a menstrual cup or tampon while at the beach or by the pool.

Classic Style. But Made to be Leakproof

Leakproof swimwear isn’t just period proof; it’s designed to catch all of life’s pesky leaks, including light bladder (urine) leaks. Plus, the styles are classic silhouettes you’ll love wearing whether you’re on your period or not. Comfy in or out of water, get ready to meet your new favorite swimwear!

Chlorine & Seawater Resistant. SPF 50 Protection.

Not only is the fabric in Knix swimwear chlorine and seawater resistant, but they also have 50+ SPF protection. That means you’re good to go in any body of water of your choice.

How does Knix Period Swimwear work?

Period Swimwear FAQs

The layers in the gusset of the underwear work to trap and absorb your period so it doesn't leak in the water (or on land!) Our Swimwear features the same Leakproof Technology as our Period Underwear with an additional thin layer of waterproof material for extra protection.

The inner layers absorb the blood and traps it, so there's no leakage when you swim. When it goes in the laundry with detergent, it releases through the top layer— leaving your swim fresh and clean for tomorrow's laps. Reminder: No bleach or softener, and lay flat to dry.

Our Leakproof Swimwear has a super discreet absorbent pad in the gusset liner that absorbs up to 3 tsps of blood, which equals about 3 tampons.

You don’t need to. Every period is different though, and we recommend doing whatever makes you feel most confident. Knix Period 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.

The layers in the underwear work to trap and absorb blood while you swim. We want you to feel 100% confident in your Period Swimwear, so if it is a heavy flow day, we suggest wearing tampons or menstrual cups with your suit for worry-free swim protection.

After your swim, just machine-wash the swimwear on a cold cycle and lay flat to dry. Do not bleach.

Definitely. Our swimwear is seawater and chlorine resistant and has 50+ SPF protection!