Leakproof Front-to-Back Liner Underwear Bikini

Designed with our longest gusset ever, it has full-coverage protection that goes all the way up the front, and all the way up the back, and absorbs the same as about 2.5 super tampons or 1 regular pad. Perfect for front sleepers, back sleepers, and everyone in between.

you asked, we made it, our widest gusset ever.
Image of a chrome heart surrounding text
Image of a absorbancy surrounding text
Holds about 2.5 super tampons' or 1 regular pads' worth of blood.
Image of a light and comfy surrounding text
Texture feels smooth against the skin for added comfort.
Allows air to circulate to keep you cool and dry.
Image of a breathable surrounding text

Designed with our longest gusset ever, it has full-coverage protection that goes all the way up the front, and all the way up the back, and absorbs the same as about 2.5 super tampons or 1 regular pad. Perfect for front sleepers, back sleepers, and everyone in between.

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

Lining: 84% Modal, 8% Seaweed, 8% Spandex

Gusset: Fresh Fix Technology®, 100% Polyester, Polyurethane Film


Machine wash cold with mild detergent, do not bleach, tumble dry on low.

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 for 30 days! Learn more about our First Pair Risk-Free Policy.

We offer free standard 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. During high volume periods, your order may take up to 7 business days to dispatch from our warehouse location. 


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.
Image of a chrome star surrounding text

Each pair has a built-in liner that absorbs period blood. Kt Period Underwear is categorized by lightest, medium and heavy flows so you can find the right pair for your teen’s needs.

All of our period underwear, swimwear, reusable pads, and activewear have our patented leakproof technology built right in. Liner’s are discreet and comfortable, and fit for your teen’s unique flow. 

That’s up to your teen or tween! Every flow and comfort level is different.

Depending on the absorbency level of the period underwear and the heaviness of your teen’s flow, they can wear our period undies on their own or as a backup to tampons or menstrual cups. 

We always recommend they choose an option that makes them feel most confident!

Step 1: Give your teens 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.

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 for 30 days!


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.


Underwear purchased as part of the Period Party Sale is eligible for exchange or store credit only. No refunds. Sale items are not eligible for our First Pair Risk Free Policy.


Super Sleepover Shorts and Reusable Pads purchased as part of the Period Party Sale are final sale. No exchanges or refunds can be accommodated.

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 4.2 out of 5
Based on 35 reviews
  • 5 Stars
    26 Reviews
  • 4 Stars
    0 Reviews
  • 3 Stars
    3 Reviews
  • 2 Stars
    2 Reviews
  • 1 Star
    4 Reviews
74% 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
35 Reviews
Reviewed by Sue C.
Verified Buyer
I recommend this product
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Pant Size
Teen 12-16
Size Purchased
M
Usage
  • Period
Rated 5 out of 5
Review posted

The best overnight underwear for teen

The best overnight underwear , don’t have to worry about leaks anymore or messy business . Comfortable and easy to wash.

Loading...
Quality
Rated 5 out of 5
Comfort
Rated 5 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 5 out of 5
Was this helpful?
Reviewed by LegerLove
Verified Buyer
I recommend this product
Pant Size
Teen 12-16
Size Purchased
L
Usage
  • Primary Protection
Rated 5 out of 5
Review posted

Pleasantly Surprised

These are my go to on heavy days, they are fantastic and definitely my new pantie bestie.

Loading...
Quality
Rated 5 out of 5
Comfort
Rated 5 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 5 out of 5
Was this helpful?
Reviewed by Lisa F.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Good

Pike the Full Gusset coverage.

Loading...
Was this helpful?
Reviewed by Amy R.
Verified Buyer
I recommend this product
I'm a...
Adult
I purchased for...
Myself
Pant Size
Teen 18-20
Size Purchased
M
Usage
  • Period
  • Back-up Protection
Rated 5 out of 5
Review posted

Best coverage EVER!

Of my 35 plus years of having to “deal” with my monthly “womanhood”, these are the first pair of underwear that gives me full confidence in knowing that I am FULLY covered and no leakage. Thank you for coming up with this awesome design and in Cotton To boot!!! Looooove these and hope to see more colours and designs in the future!

Loading...
Quality
Rated 5 out of 5
Comfort
Rated 5 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 5 out of 5
Was this helpful?
Reviewed by Amy R.
Verified Buyer
I recommend this product
I'm a...
Adult
I purchased for...
Myself
Pant Size
Teen 18-20
Size Purchased
M
Usage
  • Back-up Protection
  • Period
  • Primary Protection
Rated 5 out of 5
Review posted

True FULL coverage!

Of my 35 plus years of having to “deal” with my monthly “womanhood”, these are the first pair of underwear that gives me full confidence in knowing that I am FULLY covered and no leakage. Thank you for coming up with this awesome design and in Cotton To boot!!! Looooove these and hope to see more colours and designs in the future!

Loading...
Quality
Rated 5 out of 5
Comfort
Rated 5 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 5 out of 5
Was this helpful?