Light Leakproof No-Show Underwear Bikini 3-Pack

These period undies protect teens against leaks, sweat, and discharge. A classic silhouette made from soft, stretchy, quick-drying fabric with a thin liner that absorbs the same as about 1 regular tampon. Wear them as everyday underwear, as full protection on light days, or backup on heavy days.

Key Features:

- Quick-Drying

- Moisture and Sweat Wicking

- Absorbs the same as about 1 regular pantyliner/tampon

- Super soft & stretchy

- Invisible under leggings or shorts (aka no visible seam lines)

- Patented leakproof technology

Kt period underwear and pads are now sales tax-free in Canada.* We celebrate improvements to the accessibility and affordability of essential period care products. Learn More.

Your teen’s fave comfy period undies, now in a 3-pack.
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Each pair holds the same as about 1 regular tampons worth of blood, sweat or discharge.
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Rapidly absorbs moisture to keep you fresh and dry all day.
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Thin, subtle, and designed to feel just like regular underwear.
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Simply care with mild detergent and machine wash on cold.

These period undies protect teens against leaks, sweat, and discharge. A classic silhouette made from soft, stretchy, quick-drying fabric with a thin liner that absorbs the same as about 1 regular tampon. Wear them as everyday underwear, as full protection on light days, or backup on heavy days.

Key Features:

- Quick-Drying

- Moisture and Sweat Wicking

- Absorbs the same as about 1 regular pantyliner/tampon

- Super soft & stretchy

- Invisible under leggings or shorts (aka no visible seam lines)

- Patented leakproof technology

Kt period underwear and pads are now sales tax-free in Canada.* We celebrate improvements to the accessibility and affordability of essential period care products. Learn More.

Body: 77% Nylon, 23% Xtra Life Lycra 

Lining: 86% Cotton, 10% Spandex, 4% Carbon 

Gusset: Fresh Fix Technology® 


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

For items with a 20% or more discount, you may exchange for another item or return for store credit. No refunds can be accommodated. 

Items marked as “Flash Sale” or “Clearance” are final sale, meaning no returns, exchanges or refunds can be accommodated. No exceptions. 

Please note: Sale items are not eligible for 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.

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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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FOR REAL LIFE
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FOR THIS GENERATION
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nothing is tmi here—we promise.
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Heavy Absorbency

Absorbs about the same as 3 super tampons. Perfect for overnight protection or your teens heaviest days when changing into a fresh pair might not be convenient.


Moderate Absorbency

Absorbs about 2.5 super tampons' worth of blood. Ideal for medium period days, discharge and sweat.


Light Absorbency

Absorbs about the same as about 1 regular tampon worth of blood, sweat or discharge. Ideal for lightest period days, spotting, sweat and discharge.

All of our period underwear, swimwear, reusable pads, and activewear have our patented leakproof technology built right in.

First Layer: Moisture-wicking, antibacterial 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 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.

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.


All Mystery Bundles are Final Sale.

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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 4.5 out of 5
Based on 281 reviews
  • 5 Stars
    219 Reviews
  • 4 Stars
    26 Reviews
  • 3 Stars
    6 Reviews
  • 2 Stars
    11 Reviews
  • 1 Star
    19 Reviews
88% 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
Write a Review
Review posted
Reviewed by Kristin C.
Verified Buyer
Light Leakproof No-Show Underwear Bikini 3-Pack
Reviewing
Light Leakproof No-Show Underwear Bikini 3-Pack
Pant Size
Kids 8-10
Size Purchased
XS
Rated 5 out of 5

Perfect protection night and day

I initially bought these for my tween as bedtime period leak protection but she found them so comfortable that she now wears them to school without any fear of leaking. I love that they’re not bulky through her clothes- she’s even worn them under her leotard for dance classes. Thank you Knix for turning a time that could’ve been embarrassing or anxiety provoking into some form of normalcy and confidence.

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I recommend this product
Quality
Rated 4 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
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 Sarah B.
Verified Buyer
Light Leakproof No-Show Underwear Bikini 2-Pack
Reviewing
Light Leakproof No-Show Underwear Bikini 2-Pack
Pant Size
Teen 4-10
Size Purchased
S
Usage
  • Other
Rated 5 out of 5

12 yo loves them!

I bought these for my tween to be ready for when the time comes. I noticed them in her laundry and asked if she had, indeed, started her period. She said, no, they're just so comfortable." So, no review about protection yet, but apparently comfortable enough to wear anyway!

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I recommend this product
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
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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Review posted
Reviewed by Alicia B.
Verified Buyer
Light Leakproof No-Show Underwear Bikini 3-Pack
Reviewing
Light Leakproof No-Show Underwear Bikini 3-Pack
Pant Size
Teen 00-2
Size Purchased
S
Usage
  • Back-up Protection
  • Primary Protection
  • Period
Rated 5 out of 5

My daughter loves them!

My daughter just started her period and these are great for her lighter days and as backup! She's asked me to buy her a few more pairs because these are much more comfortable and less obvious when worn with leggings than a previous brand we had purchased.

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I recommend this product
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
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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Review posted
Reviewed by Tina A.
Verified Buyer
Light Leakproof No-Show Underwear Bikini
Reviewing
Light Leakproof No-Show Underwear Bikini
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Pant Size
Kids 12-14
Size Purchased
S
Usage
  • Period
Rated 5 out of 5

Daughter loves these!

Easy to wear, change and clean. Highly recommend!

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I recommend this product
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
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Review posted
Reviewed by Rebecca R.
Verified Buyer
Light Leakproof No-Show Underwear Bikini
Reviewing
Light Leakproof No-Show Underwear Bikini
Pant Size
Kids 12-14
Size Purchased
S
Usage
  • Back-up Protection
  • Period
Rated 5 out of 5

Really comfy and descreet

I think these asr perfect to wear on light days and are perfect for my gymnastics because they are tan!

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I recommend this product
Quality
Rated 4 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
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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