Heavy Period Kit

Our most protective kit yet features four pairs of black Super Leakproof Underwear and one black Super Sleepover Short, all in a reusable pouch. Both styles are made with our patented, 3-layer leakproof technology.

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. 

Guaranteed confidence, no matter how heavy things get.
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Holds up to 3-12 tsp worth of blood.
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Rapidly absorbs moisture to keep you fresh and dry all day.
Antimicrobial layer kills bacteria and neutralizes smells.
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Includes sleep short designed with a longer gusset to prevent leaks all night long.

Our most protective kit yet features four pairs of black Super Leakproof Underwear and one black Super Sleepover Short, all in a reusable pouch. Both styles are made with our patented, 3-layer leakproof technology.

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. 

Super Leakproof Underwear

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. 


Super Sleepover Short

Body: 70% nylon, 30% LYCRA®

Gusset Top Layer: 84% Modal, 8% Seaweed Fiber, 8% Spandex

Gusset 2nd Layer: 100% Polyester

Gusset 3rd Layer: Leakproof Technology

Free from PFAS and other chemical treatments.

Machine wash cold with mild detergent, do not bleach, lay flat to dry.


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.


We ship our items via DHL, or Canada Post depending on your location. Please allow 1-2 business days for your order to dispatch.  

For orders to Canada 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.  

Please note: orders placed on Friday after 1 pm will not be processed until the following Monday.  

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FOR THE PLANET
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FOR REAL LIFE
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FOR THE PLANET
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FOR REAL LIFE
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FOR THIS GENERATION
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FOR THE PLANET
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FOR REAL LIFE
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FOR THIS GENERATION
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FOR THE PLANET
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FOR REAL LIFE
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FOR THIS GENERATION
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FOR THE PLANET
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FOR REAL LIFE
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FOR THIS GENERATION
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FOR THE PLANET
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FOR REAL LIFE
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FOR THIS GENERATION
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FOR THE PLANET
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nothing is tmi here—we promise.
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Super absorbency

absorbs up to 12 tsp (60 ml) of bloodthats 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.

You can find your size here

If you're still not sure which size underwear to get, just book a virtual fitting and someone from the kt team will video chat you to walk you through everything! Book Now

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.

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COMFORTABLE
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ABSORBENT
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JUST PLAIN BETTER
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REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
Image of a chrome heart surrounding text
JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
Image of a chrome heart surrounding text
JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
Image of a chrome heart surrounding text
JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
Image of a chrome heart surrounding text
JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
Image of a chrome heart surrounding text
JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
Image of a chrome heart surrounding text
JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
Image of a chrome heart surrounding text
JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Reviews
average rating 4.7 out of 5
Based on 6 reviews
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100% of reviewers would recommend this product to a friend
6 Reviews
Reviewed by Jade
Verified Reviewer
I recommend this product
Rated 5 out of 5
Review posted

The Best Underwear for Heavy Periods

I purchased this kit because I have a HEAVY flow that just won't quit some days. It really works so well! I know all my friends thought it would feel like "sitting in a diaper" but boy are they wrong! The underwear stays dry and comfortable. The kit is such a good deal for the 4 underwear, shorts and pouch too that get me through my entire cycle. Worth it!

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Reviewed by Christine
Verified Reviewer
I recommend this product
Rated 5 out of 5
Review posted

Teen Approved

I bought this kit for my daughter who is absolutely in love! She used to go through 3-4 pads a day, but just wears one pair of these Super 'Oh-No' Proof underwear now! It's perfect for her since there's just enough underwear included to get her through the most heavy days of her cycle, plus the shorts for nighttime. Such a great product!

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Reviewed by Favour O.
Verified Reviewer
I recommend this product
Rated 4 out of 5
Review posted

Need to size down

I love the actual product! Into ally I was frustrated cause I measured myself and according to the size guide I was a medium but the medium set was loose and the underwear stretches out after even one use. The sleepover short fell off me they were so big!

The customer service is great though and I was able to get a set in a size small which fits great :)

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Reviewed by Victoria
Verified Reviewer
I recommend this product
Rated 5 out of 5
Review posted

Where has this been all my life?

Have a teen girl who is still shy about her period. This is so much easier for her than changing bulky pads all day. They are comfy and discreet. We got one pair to try and went back for the period kit. She loves her KT! Great for her and so much better for the environment too.

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Reviewed by Sandrine V.
I recommend this product
Rated 5 out of 5
Review posted

Excellent achat!

J’ai acheté cet ensemble pour ma fille, qui a ses règles depuis peu. Elle a un flux assez abondant, elle doit souvent changer ses serviettes sanitaires, et elle voyait ses règles comme quelque chose d’extrêmement désagréable. J’ai décidé de lui faire essayer les culottes menstruelles, et elle les adore! Celles-ci sont parfaites pour les règles plus abondantes. La journée la plus abondante de son cycle, elle change de culotte sur l’heure du dîner; mais pour les 6 autres jours, elle utilise la même culotte toute la journée. Elle n’a jamais eu de fuite. Elle adore aussi la paire de boxers de nuit, parce qu’elle avait toujours peur de tacher ses draps la nuit... mais maintenant cela ne l’inquiète plus. Je suis vraiment heureuse de lui avoir fait essayer ce kit. Nous allons certainement en acheter d’autres à l’avenir!

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