Super Leakproof® No-Show Underwear Boyshort 3-Pack

With the ability to hold about 3 super tampons’ or 1.5 regular pads' worth of blood, this super-absorbent boyshort underwear works just as hard as you do—no backup needed. With our patented leakproof technology and quick-drying fabric, they’re a game-changer for training and recharging with protection against sweat, discharge, and blood, on heavy days or nights.

Key Features:

- Quick-Drying

- Moisture and Sweat Wicking

- Absorbs the same as about 3 super tampons or 1.5 regular pads

- Super soft & stretchy

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

- Patented leakproof technology

school. sofa. sleep. you’ll wear these period undies everywhere.
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Holds the same as about 3 super tampons
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Rapidly absorbs moisture to keep you fresh and dry all day.
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Allows air to circulate to keep you cool and dry.

With the ability to hold about 3 super tampons’ or 1.5 regular pads' worth of blood, this super-absorbent boyshort underwear works just as hard as you do—no backup needed. With our patented leakproof technology and quick-drying fabric, they’re a game-changer for training and recharging with protection against sweat, discharge, and blood, on heavy days or nights.

Key Features:

- Quick-Drying

- Moisture and Sweat Wicking

- Absorbs the same as about 3 super tampons or 1.5 regular pads

- Super soft & stretchy

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

- Patented leakproof technology

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


Body: 70% Nylon, 30% Spandex 

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

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

 

Additional Product Ingredient Information

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 $70. 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.

US Orders: Please allow 3–10 business days for orders to arrive. 

International Orders: Please allow 10–25 business days for orders to arrive.  

NOTE: Orders placed on Friday after 1 PM will not be processed until the following Monday.   

CANADIAN CUSTOMERS: Shop www.knixteen.ca to order in Canadian currency.

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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.

Each pair has a built-in liner that absorbs period blood. Kt Period Underwear is categorized by light, moderate 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 your teen find their 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 your teen can try their 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.

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Sustainable
Image of a chrome heart surrounding text
Absorbent
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Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Image of a chrome heart surrounding text
Comfortable
Image of a chrome heart surrounding text
Sustainable
Image of a chrome heart surrounding text
Absorbent
Reviews
average rating 4.7 out of 5
Based on 257 reviews
  • 5 Stars
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94% of reviewers would recommend this product to a friend
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Review posted
Reviewed by Sophia A.
Verified Buyer
Super Leakproof® No-Show Underwear Boyshort 3-Pack - Kit Item
Reviewing
Super Leakproof® No-Show Underwear Boyshort 3-Pack - Kit Item
I'm a...
Adult
I purchased for...
Myself
Pant Size
Teen 18-20
Size Purchased
XS
Usage
  • Period
  • Primary Protection
Rated 5 out of 5

EXCEPTIONAL Undies!

These undies have crazy good coverage! Even with a heavy flow not a drop leaks through. I trust them with my life and you can’t see them under even the sleekest dress. 🩷

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Rated 5 out of 5
Comfort
Rated 5 out of 5
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Rated 5 out of 5
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Reviewed by Chanda M.
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Super Leakproof® No-Show Underwear Boyshort 3-Pack
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Super Leakproof® No-Show Underwear Boyshort 3-Pack
Rated 5 out of 5

Work great

My daughter has sensory issues and is in the spectrum. She loves the Knixteen products. They're comfy, no itchy seams, and they work!!! We've been using them for over two years now with absolutely no issues. I definitely recommend their products

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Reviewed by Connie W.
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Super Leakproof® No-Show Underwear Boyshort
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Super Leakproof® No-Show Underwear Boyshort
Rated 5 out of 5

Second purchase

Bought some for a teen 2 years ago and they had lasted until now. She wears them every day! They finally wore out and had to purchase another set recently. Side note: about a year ago both of us have the swimsuit one and love it as well.

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Reviewed by Amber H.
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Super Leakproof® No-Show Underwear Boyshort 3-Pack
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Super Leakproof® No-Show Underwear Boyshort 3-Pack
Rated 5 out of 5

Perfect & comfortable

Love these for myself, a mom in her 40s! The material is better than any others I’ve tried and I love the fit, especially when bloated :)

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Reviewed by Jenn N.
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Super Leakproof® No-Show Underwear Boyshort
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Super Leakproof® No-Show Underwear Boyshort
Rated 5 out of 5

BEST Period Protection for Teens

These are hands down the BEST period protection panties for teens! They offer superior leak control all while being very light weight and breathable. In addition KT by Kinx is the PERFECT size for preteen and teen bodies.

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