Super Leakproof Bikini

With the ability to hold up to 8 tampons or pads worth of blood, this super absorbent bikini can do it all—no backup needed. Made with our patented, 3-layer leakproof technology built in.

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 8 tampons or pads.

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

the power of 8 tampons or pads, without all the bathroom breaks.
Image of a chrome heart surrounding text
Image of a absorbancy surrounding text
Holds up to 8 tampons or pads worth of blood.
Image of a light and comfy surrounding text
Thin, subtle, and designed to feel just like regular underwear.
Image of a moisture fabric surrounding text
Rapidly absorbs moisture to keep you fresh and dry all day.
Antimicrobial layer kills bacteria and neutralizes smells.

With the ability to hold up to 8 tampons or pads worth of blood, this super absorbent bikini can do it all—no backup needed. Made with our patented, 3-layer leakproof technology built in.

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 8 tampons or pads.

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

Main Body: 70% Nylon, 30% Spandex  

Gusset Top Layer (Moisture Wicking + Anti-Odor): 87% Seaweed Fiber, 13% Modal  

Gusset 2nd Layer (Absorbent Fabric): 100% Polyester  

Gusset 3rd Layer (Fresh Fix Technology) 

Gusset 4th Layer (Waterproof Membrane): Polyurethane Film   


Free from PFAS and other chemical treatments.  

Machine wash cold with mild detergent, do not bleach, tumble dry on low.

Because they’re, well, underwear—we can’t accept exchanges or returns on used items BUT you can try your first-pair on your first order, risk-free!  

What's First-Pair Risk-Free?  

If your first order includes multiple period underwear: OPEN, WASH & WEAR ONE PAIR ONLY to test them out. That way, in the unlikely event that you don’t love them, any unopened packages from the same purchase can be exchanged or refunded back to you within 30 days of delivery (excluding original shipping fees).  All unopened packages will be donated to local organizations to support people in need.

*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.

US Orders: Please allow 3–10 business days for orders to arrive.

International Orders: Please allow 10–25 business days for orders to arrive.


NOTE: Orders placed on Friday after 1 PM will not be processed until the following Monday.
CANADIAN CUSTOMERS: Shop www.knixteen.ca to order in Canadian currency.

Reviews