Super Leakproof Underwear Boyshort

Highly absorbent (and very cute!) boyshorts with added coverage, featuring 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.

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

school. sofa. sleep. you’ll wear these period undies everywhere.
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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.

Highly absorbent (and very cute!) boyshorts with added coverage, featuring 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.

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.  

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 $80.

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.


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.


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

FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
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.

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
Reviews
average rating 4.7 out of 5
Based on 336 reviews
  • 5 Stars
    268 Reviews
  • 4 Stars
    45 Reviews
  • 3 Stars
    16 Reviews
  • 2 Stars
    4 Reviews
  • 1 Star
    3 Reviews
96% 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
336 Reviews
Reviewed by Alex
Super Leakproof Boyshort
Reviewing
Super Leakproof Boyshort
I recommend this product
Rated 5 out of 5
Review posted

These Work.

I was suspicious this underwear would meet its claims - holding about 8 tampons worth?! But OMG! This underwear WORKS. On my heaviest days, I’ll wear these from morning until bedtime and have never had one leak. I was literally SHOCKED! Even better they feel completely dry all the time! The only thing I’d say is they seem to fit slightly smaller than KT’s regular oh-no proof underwear, so I’d recommend going up a size.

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Reviewed by ANJELICA B.
Verified Buyer
Super Leakproof Boyshort
Reviewing
Super Leakproof Boyshort
I recommend this product
Rated 5 out of 5
Review posted

Astonished

I purchased these for my teen. She started her period at a young age so I feel like we've tried every pad under the sun to find something that was comfortable and "didn't look like a diaper". Our biggest concern were the night leaks/overflow but I have to say, Knix did the job! I didn't expect for them to do so well! I was astonished! No leaks, no overflow. My daughter was very happy which makes me happy.

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Reviewed by Fernanda
Verified Buyer
Super Leakproof Boyshort
Reviewing
Super Leakproof Boyshort
I don't recommend this product
I'm A...
Adult
I purchased for...
Myself
Pant Size
Teen 4-10
Size Purchased
L
Usage
  • Back-up Protection
Rated 2 out of 5
Review posted

Inconsistent sizing

I really wanted to love these! I ordered three panties (two Super Leakproof Boyshort and one Leakproof Boyshort) and even though I utilized the chart and read the reviews to help me get the correct size, they are too big. I did wait to get my period to see if I would be bloated and then the panties would fit, but they were still too big, especially the Super Leakproof Boyshort! Definitely disappointed. As reference I'm 137lb, 5'04', hips 39, I ordered the Large size and is way too big.

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Quality
Rated 5 out of 5
Comfort
Rated 3 out of 5
Sizing
Rated 2 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 3 out of 5
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Reviewed by Rebecca F.
Verified Buyer
Super Leakproof Boyshort
Reviewing
Super Leakproof Boyshort
I recommend this product
Rated 5 out of 5
Review posted

Excellent for heavy period

My daughter has only had 3 periods, and they are Monstrously heavy. I had ordered the normal period underwear in preparation for her getting her period and they were no match, but these new heavy flow ones are excellent! Thank you!!!

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Reviewed by Andrea L.
Verified Buyer
Super Leakproof Boyshort
Reviewing
Super Leakproof Boyshort
I recommend this product
Rated 5 out of 5
Review posted

Reliable comfort

My daughter thinks these are so comfortable and don’t have a visible panty line even with her yoga tights . They hold everything they are supposed to without any leaks. She is a believer!

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