Period-Proof Swimwear

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Cute, comfortable, leakproof swimsuits to take on swim laps or beach day.

  • Black
Period Swim Bottom High Rise Cheeky
Medium Absorbency
$35 USD
  • Black
Period Swim Bottom Bikini
Medium Absorbency
$35 USD
  • Black
Period Swim Sport One-Piece
Medium Absorbency
$80 USD
nothing is TMI here—we promise.
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All of our swimsuits have the same patented 3-layer leakproof technology as our underwear, plus an additional layer of waterproof material. Here’s the breakdown:

First Layer: Moisture-wicking, antimicrobial technology wicks away sweat and moisture while neutralizing odors to keep you fresh all day long.

Second Layer: A super thin, highly absorbent liner that holds the power of 3 tampons or pads.

Third Layer: A secure, liquid-resistant outer layer keeps leaks from happening.

Fourth Layer: A thin layer of waterproof material for extra protection.

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 pads.

Not always. When your flow is light, Kt Swimwear can be worn alone without any additional period protection. On super heavy days, the swimwear works great as backup protection with a tampon or menstrual cup. Every period is different though, and we recommend doing whatever makes you feel most confident.

The layers in the gusset of the underwear work to trap and absorb blood. We want you to feel 100% confident in your Kt Swimwear, so if you're having a super heavy flow day, we suggest wearing a tampon or menstrual cup with your suit.

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

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

Check out our size chart here. If you want some help, we have virtual fitters ready on deck to help you find your perfect fit. Book a video call with them today.

Yes! All Kt Period-Proof Swim Bottoms and One-Pieces are eligible for a return or exchange within 30 days of delivery, as long as the original sanitary strip and tags are attached. Kt Swim Tops are eligible for a return or exchange within 30 days of delivery with original tags attached.

*All sale items are final sale.

Absolutely. Kt Swimwear looks and feels just like regular swimwear with a barely-there, leakproof liner.

Our styles are made to fit teen bodies. For Period-Proof Swimwear in adult sizes, please visit Knix.