Cotton Super Leakproof Boxer Brief

Ultra-soft cotton boxer brief featuring extra leg length and our longest super leakproof gusset ever. Absorbs up to 10 tampons or pads worth of blood!

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 10 tampons or pads.

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

the most requested underwear in our lineup.
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Holds up to 10 tampons or pads worth of blood.
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.
Designed with a longer gusset for front-to-back coverage.

Ultra-soft cotton boxer brief featuring extra leg length and our longest super leakproof gusset ever. Absorbs up to 10 tampons or pads worth of blood!

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 10 tampons or pads.

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

Body: 47% Cotton, 47% Modal, 6% Spandex

Gusset Top Layer (Moisture Wicking + Anti-Odor): 84% Modal, 8% Seaweed Fiber, 8% Spandex

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

Gusset 3rd Layer (Hydrophilic + Waterproof): 100% Polyester

Gusset 4th Layer (Waterproof Membrane): PU 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 3.7 out of 5
Based on 15 reviews
  • 5 Stars
    8 Reviews
  • 4 Stars
    2 Reviews
  • 3 Stars
    1 Review
  • 2 Stars
    1 Review
  • 1 Star
    3 Reviews
73% of reviewers would recommend this product to a friend
Quality
Rated 3 out of 5
Comfort
Rated 3 out of 5
Sizing
Rated 1 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
15 Reviews
Reviewed by Teresa M.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

She loves them!!!

My 11 yr old has been trying your period proof underwear for almost a year now. After a few tries with the briefs, she's loving the extended gusset and fit and feel off these new boxers! Thank you for listening to our comments and providing this great new product! Going to have to buy more!

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Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
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Reviewed by Esmeralda L.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Super comfortable & Great Fit!

Bought these for my younger sister who started her cycle at a very young age. Bulky pads and having to adjust to this new stage of her life while trying to just be a kid was hard for her. These boxer briefs fit her tomboy style and have given her confidence with having to deal with her cycle at school. THANK YOU!

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Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
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Reviewed by Natalie
Verified Reviewer
I recommend this product
I'm a...
Parental Figure
I purchased for...
Myself
Pant Size
Teen 12-16
Size Purchased
M
Usage
  • Back-up Protection
  • Period
Rated 4 out of 5
Review posted

Look super comfy & super absorbent

I just received my first pair of the new boxer briefs & ordered size med as that’s the size in underwear I wear , it seems these run a little bigger as they look quite big & baggie

I think I’ll have to size down to a sm on next order . But overall look like they will b perfect

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Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Sizing
Rated 1 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 5 out of 5
Was this helpful?
Reviewed by H.B.
Verified Buyer
I don't recommend this product
I'm a...
Adult
I purchased for...
Myself
Pant Size
Teen 12-16
Size Purchased
M
Rated 1 out of 5
Review posted

Bulky and sizing seems way too large

Sizing is way larger than the bikini and boyshort, both of which fit me perfectly. Was not comfortable. Bulky. Fits extremely high. Too loose around the legs, which makes it hard to put pants on over top (starts to roll up around the legs).

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Quality
Rated 2 out of 5
Comfort
Rated 2 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 1 out of 5
Was this helpful?
Reviewed by Ash
Verified Buyer
I recommend this product
Rated 4 out of 5
Review posted

Really good

I purchased size L and size S. While the large size was a perfect fit, the small size is a complete size bigger.

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Fit
Rated 1 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
Was this helpful?