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

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

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.

Please note, items that are 35% off or less are eligible for exchange or store credit. All items marked "Black Friday Deals" are final sale.

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 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 REAL LIFE
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FOR THIS GENERATION
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FOR REAL LIFE
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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 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
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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 257 reviews
  • 5 Stars
    203 Reviews
  • 4 Stars
    24 Reviews
  • 3 Stars
    5 Reviews
  • 2 Stars
    11 Reviews
  • 1 Star
    14 Reviews
89% 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 Amelia Fuertes R.
Verified Buyer
POS - Light Leakproof No-Show Underwear Bikini
Reviewing
POS - Light Leakproof No-Show Underwear Bikini
Pant Size
Teen 18-20
Size Purchased
M
Usage
  • Back-up Protection
  • Primary Protection
  • Sweat
  • Other
  • Period
Rated 5 out of 5

Fantastic!

Super comfy and cute. Definitely will buy more! I'd use them as regular underwear, not just during my period.

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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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Reviewed by Tia G.
Verified Buyer
Light Leakproof No-Show Underwear Bikini 3-Pack
Reviewing
Light Leakproof No-Show Underwear Bikini 3-Pack
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Pant Size
Teen 00-2
Size Purchased
S
Usage
  • Primary Protection
  • Period
Rated 5 out of 5

Fits to size

Bottoms fit as expected

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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 Kristin 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
Teen 4-10
Size Purchased
S
Rated 5 out of 5

Work great

Very comfortable fit

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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 4 out of 5
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Reviewed by Lily D.
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Light Leakproof No-Show Underwear Bikini
Reviewing
Light Leakproof No-Show Underwear Bikini
Rated 5 out of 5

These are my absolute favourite!

This is my 6th pair of Knix Teen light leakproof no-show underwear. I wanted to grab an extra pair so I wouldn't have to worry about washing until the end of my period. I like to wear a nixit disc for my first two days with these and then the light leakproof underwear is good enough for me for my last 3 days! They are comfy, I can wear them with tight clothes (though some styles I find they look a little funny in the back - i.e. I don't think I'd wear them with just leggings - I prefer thongs for that), and I'm not worried about leaking! For the record, I'm 25 years old, 5'3, about 120lbs, and a size small in the adult sizes but a size medium in the teen sizes. While I still dislike my period, these make me dread it much less!

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Reviewed by T
Verified Buyer
Light Leakproof No-Show Underwear Bikini
Reviewing
Light Leakproof No-Show Underwear Bikini
Rated 5 out of 5

panty

Like that it have the Leakproof protection liner. Material is also soft, comfortable and fits well.

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