(Test) Super Leakproof Bikini


absorbs up to 8 tsp of blood - that’s 8 tampons!
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absorbs up to 8 tsp of blood - that’s 8 tampons!
absorbs up to 8 tsp of blood - that’s 8 tampons!
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absorbs up to 8 tsp of blood - that’s 8 tampons!

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. 

*For hygiene reasons all underwear are final sale.

Due to COVID-19 precautionary measures, there may some delays shipping your order.

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.

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nothing is tmi here—we promise.
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Super Absorbency

Absorbs up to 12 tsp (60 ml) of blood—that’s about 12 regular tampons or pads! Perfect for overnight protection or on your heaviest days when changing into a fresh pair might not be convenient.

High Absorbency

Absorbs up to 4-8 tsp (20-40 ml) of blood or the equivalent of 4-8 tampons or pads. These are perfect for heavy flow days.

 Medium Absorbency

These absorb approximately 3 tsp (15 ml) or about 3 tampons or pads worth of blood! Ideal for light to medium flow days or as backup to tampons or period cups.

All of our period underwear, swim, and activewear have our patented, 3-layer leakproof technology built right 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 3-12 tampons or pads.

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

The short answer: nope! Depending on the level of absorbency of leakproof period underwear you choose and the heaviness of your flow, you can wear our period undies on their own or as backup protection along with a pad or tampon. You're totally protected with our high and super absorbency leakproof underwear, while our low and medium absorbency leakproof underwear can replace pads and tampons on lighter days and work great as a backup to whatever youre already using on heavier days.

Do a quick rinse before you throw your underwear in the machine. Wash on cold with mild detergent then tumble dry on low. That's it! Be sure not to use softener or bleach and never iron... Not that you would.

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!

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!

How it works:

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 dont 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.

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