Period Swim Bottom Bikini

This classic silhouette looks just like any regular swim bottom and is even designed with 50+ SPF protection. Plus, it’s seawater- and chlorine- resistant, and made with our patented,  3-layer leakproof technology plus an extra layer of waterproof fabric. 

First layer: Moisture-wicking, antimicrobial technology quickly absorbs 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.
Third layer: A secure, liquid-resistant outer layer keeps leaks from happening.
Fourth layer: Another thin layer of waterproof material for extra protection.

Wear it as backup with a tampon or menstrual cup on heavier days or wear it alone on lighter days.

 

finally, a swim bottom you can cannonball in even when you’re on your period.
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Holds up to 3 tampons or pads worth of blood.
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Rapidly absorbs moisture to keep you fresh and dry all day.
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Thin, subtle, and designed to feel just like regular swimwear.
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Simple care with mild detergent and machine wash on cold.

This classic silhouette looks just like any regular swim bottom and is even designed with 50+ SPF protection. Plus, it’s seawater- and chlorine- resistant, and made with our patented,  3-layer leakproof technology plus an extra layer of waterproof fabric. 

First layer: Moisture-wicking, antimicrobial technology quickly absorbs 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.
Third layer: A secure, liquid-resistant outer layer keeps leaks from happening.
Fourth layer: Another thin layer of waterproof material for extra protection.

Wear it as backup with a tampon or menstrual cup on heavier days or wear it alone on lighter days.

 

Body: 85% Nylon, 15% Spandex

Lining: 85% Nylon, 15% Spandex

Gussets: 

1. Hydrophilic + Waterproof Layer 100% Polyester with FreshFix™ Technology 

2. Waterproof Membrane Pu Film

Fabric is seawater and chlorine resistant and has 50+ SPF protection. 

Machine-wash cold, lay flat to dry. Do not bleach.

Eligible for a return or exchange within 30 days of delivery and with original sanitary strip and tags attached.

*All sale items are final sale.

We ship our items via DHL or Canada Post depending on your location. Please allow up to 10 business days for your items to be processed and shipped.


Canadian Orders: Please allow 2–4 business days for shipping to the GTA, 3–10 business days for urban areas, and 6–15 business days for remote locations.


US Orders: Please allow 3–10 business days.


International Orders: Please allow 10–25 business days.


NOTE: Orders placed on Friday after 1 PM will not be processed until the following Monday.

Please see our Shipping page for more info.

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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 thin layer of waterproof material for extra protection. 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.

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

Fourth layer: Another 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 it is 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!

If you’re not sure which size underwear to get, just book a Virtual Fitting and someone from the Knix team will video chat you to walk you through everything!

Yes. All KT Period-Proof Swim Bottoms and One-pieces are eligible for a return or exchange within 30 days of delivery and with original sanitary strip and tags attached. KT Period-Proof 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 Underwear in adult sizes, please visit Knix.com.

COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
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