Super Leakproof Underwear 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.

 

Did you know? This product is eligible for reimbursement through your Flexible Spending Account (FSA). Learn More

the power of 8 tampons or pads, without all the bathroom breaks.
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Holds up to 8 tampons or pads worth of blood.
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Thin, subtle, and designed to feel just like regular underwear.
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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.

 

Did you know? This product is eligible for reimbursement through your Flexible Spending Account (FSA). Learn More

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.

We’ve extended our First Pair Risk-Free Policy* to give everyone a chance to try our new sizes. So even if it’s not your first order with Kt, you can return or exchange your period underwear until March 31, 2022. 

If you ordered the wrong size of period underwear, we’ll send you a different pair at no cost or offer you a standard refund within 30 days of delivery (excluding original shipping fees). If your order included multiple period underwear, open, wash and wear one pair only. That way if you don’t love them, any unopened packages from the same purchase will be eligible for an exchange or standard refund (excluding original shipping fees). All unopened packages will be donated to local organizations to support people in need. 

*Policy does not apply to sale or last call items.

We offer free shipping on all orders over $70. We ship our items via DHL or Canada Post depending on your location. Please allow 1-2 business days for your items to be processed and shipped.

*Due to warehouse updates, orders placed January 15-21 will be processed starting January 22.


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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FOR THIS GENERATION
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for the planet!
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FOR THIS GENERATION
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for the planet!
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FOR THIS GENERATION
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for the planet!
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FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
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FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
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FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
Image of a chrome heart surrounding text
FOR THIS GENERATION
Image of a chrome heart surrounding text
for the planet!
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FOR THIS GENERATION
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for the planet!
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FOR THIS GENERATION
nothing is tmi here—we promise.
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Super Absorbency

Absorbs 9–12 tsp (45–60 ml) of blood—that’s about 9–12 regular tampons or pads! Perfect for overnight protection or your heaviest days when changing into a fresh pair might not be convenient.


High Absorbency

Absorbs 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

Absorbs up to 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, swimwear, reusable pads, 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 3–20 tampons or pads.

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

The short answer: nope! Depending on the absorbency level of your period underwear and the heaviness of your flow, you can wear our period undies on their own or as a backup to pads, tampons, or menstrual cups. You can wear our High and Super absorbency underwear alone and be totally protected, while our Medium absorbency underwear can be worn alone on lighter days or as backup on heavier days.

Step 1: Give your underwear a quick rinse under cold water.
Step 2: Throw it in the washing machine with your regular clothes. Wash on cold with mild detergent (no softener or bleach).
Step 3: There are two ways to dry them depending on the undies you have: lay flat to dry for medium absorbency products, or tumble dry on low for high to super absorbency products.
Step 4: That’s it! No ironing needed.

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.

We’ve extended our First Pair Risk-Free Policy* to give everyone a chance to try our new sizes. So even if it’s not your first order with Kt, you can return or exchange your period underwear until March 31, 2022.

If you ordered the wrong size of period underwear, we’ll send you a different pair at no cost or offer you a standard refund within 30 days of delivery (excluding original shipping fees). If your order included multiple period underwear, open, wash, and wear one pair only. That way if you don’t love them, any unopened packages from the same purchase will be eligible for an exchange or standard refund (excluding original shipping fees). All unopened packages will be donated to local organizations to support people in need.

*Policy does not apply to sale or last call items.

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Sustainable
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Absorbent
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Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Reviews
average rating 4.7 out of 5
Based on 340 reviews
  • 5 Stars
    278 Reviews
  • 4 Stars
    44 Reviews
  • 3 Stars
    5 Reviews
  • 2 Stars
    6 Reviews
  • 1 Star
    7 Reviews
97% of reviewers would recommend this product to a friend
Quality
Rated 4 out of 5
Comfort
Rated 4 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Fits Small, 0 is True to Size and 2 is Fits Large
Effectiveness
Rated 4 out of 5
340 Reviews
Reviewed by Melissa Q.
Verified Buyer
Super Leakproof Bikini
Reviewing
Super Leakproof Bikini
I recommend this product
Rated 5 out of 5
Review posted

Excellent!

My daughter is able to wear these from morning until bed time even on her heaviest days. It is so nice for her not to have to worry about changing a pad every couple of hours at school (grade 6). Highly recommend!

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Reviewed by J h.
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Super Leakproof Bikini
Reviewing
Super Leakproof Bikini
I recommend this product
Rated 5 out of 5
Review posted

Best underwear ever

THESE UNDERWEAR REALLY WORK AND ARE AMAZING!! I'm 15 years old and have had my period since I was 10 years old. I have a very heavy period and normally have to worry about leaks all day long and change my pad at least every hour!! But I have no worries with these underwear and can wear them for about 24hrs without changing (even with sleeping in them)!! I was VERY sceptical since nothing else has worked for me, but now I am devastated I hesitated for this long, I wish I would have invested in these years ago! I now have 3 pairs of the oh no proof, 2 pairs of the super oh no proof, and 1 pair of the sleepover short underwear and I am planning on getting more! I went for the size M as I normally wear a size 2-4 pants, this size fits me perfect!! My mom loves them to as they are super easy to wash and care for and she doesnt have to help me get period out of all my outfits and underwear!! They are also environmentally friendly, I seriously havent made any waste for the last 5 periods, as i just wear and wash these!! Honestly you NEED these for yourself, you wont regret it trust me!!

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Reviewed by Jennifer G.
Verified Buyer
Super Leakproof Bikini
Reviewing
Super Leakproof Bikini
I recommend this product
Rated 5 out of 5
Review posted

My daughter loves them

My daughter is a gymnast. I bought her several different brands of period underwear and these were by far her favorite! She can wear a leotard and wear these with no worries during her practices.

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Reviewed by Jen
Super Leakproof Bikini
Reviewing
Super Leakproof Bikini
I recommend this product
Rated 5 out of 5
Review posted

I’m Converted!

WOW! WOW! WOW! That’s all I have to say after trying these undies. I’ve been a serial Always Infinity pad wearer for many years because this is what I felt confident would hold my period without any leaks. But, I’m officially converting to KT Super underwear! I wore these for almost 24 hours on a heavier day (overnight too) and no leaks! I’m literally amazed by how well these work, and they don’t even feel like your wearing a pad at all. There’s no wetness, no irritation, just period protection that I can count on.

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Reviewed by Sally G.
Verified Buyer
Super Leakproof Bikini
Reviewing
Super Leakproof Bikini
I recommend this product
Rated 5 out of 5
Review posted

We love these underwear

My

Daughters been wearing these even when she doesn’t have her period because they are comfortable. I would size up they run small.

Perfect for their period

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