Super Leakproof® No-Show Underwear Bikini 3-Pack

Name: Super Leakproof® No-Show Underwear Bikini 3-Pack
Brand: Knixteen
SKU: 3KT213BXXS
Price: 67.0 USD
Availability: InStock
Rating: 4.8 (206 reviews)

the power of 8 tampons or pads, without all the bathroom breaks.

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Quick Facts

Holds the same as about 3 super tampons

Image of a moisture fabric surrounding text

Rapidly absorbs moisture to keep you fresh and dry all day.

Allows air to circulate to keep you cool and dry.

Details

With the ability to hold about 3 super tampons’ or 1.5 regular pads' worth of blood, this super-absorbent bikini 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

Fabric & Care

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

Returns & Exchanges

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.

Shipping Info

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.

What do the different underwear absorbency levels mean?

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.

How does period underwear work?

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.

How does period underwear work?

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.

Does my teen need to wear a pad or tampon with period underwear?

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!

How do I wash them?

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.

What size should I get for my teen?

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.

Can I return my teens period underwear?

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.

Sustainable

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Reviews

average rating 4.8 out of 5

Based on 206 reviews

5 Stars

182 Reviews
4 Stars

13 Reviews
3 Stars

4 Reviews
2 Stars

3 Reviews
1 Star

4 Reviews

95% 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

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Review posted

Reviewed by KENDRA B.

Verified Buyer

Reviewing

Super Leakproof® No-Show Underwear Bikini 3-Pack

Pant Size

Teen 4-10

Size Purchased

Usage

Back-up Protection
Sweat

Rated 5 out of 5

Great fit!

My daughter loves the fit of these. The absorbency area is the right length and she loves that they're no-show. Many times repeat buyer!

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

Was this helpful?

Review posted

Reviewed by Gail M.

Verified Buyer

Reviewing

Super Leakproof® No-Show Underwear Bikini 3-Pack

I'm a...

Adult

I purchased for...

Myself

Pant Size

Teen 18-20

Size Purchased

Usage

Incontinence

Rated 5 out of 5

The best leakproof underwear ever!!!

I love my Knox underwear and they are now the only ones I ever wear.

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

Was this helpful?

Review posted

Reviewed by Charlene De M.

Verified Buyer

Reviewing

Super Leakproof® No-Show Underwear Bikini

I'm a...

Adult

I purchased for...

Myself

Pant Size

Teen 12-16

Size Purchased

Usage

Primary Protection
Period

Rated 5 out of 5

Impressed

I’m 39. I used these for the first time day 1 of my flow this week. Which is a super heavy one. And WOW! no leaks, super absorbent not super messy like pads, a lot more comfortable when taking a #2, unlike a diva cup, that’s also wants to push out. Still more comparable to a pad but a lot more comfortable. No leaks over night. It’s was super easy to exchange my unopened pairs to size up on my first order. They even let me keep the open pair and sent me the appropriate new size for that pair. I will 100% be recommending and ordering again.

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

Was this helpful?

Review posted

Reviewed by Maryanne M.

Verified Buyer

Reviewing

Super Leakproof® No-Show Underwear Bikini 3-Pack

Pant Size

Kids 12-14

Size Purchased

Usage

Back-up Protection
Primary Protection
Period

Rated 5 out of 5

Great for my daughter!

They fit well, seem to be excellent quality, wash up perfectly, and she loves the colors/prints!

I recommend this product

Quality	Rated 5 out of 5
Comfort	Rated 5 out of 5
Sizing	Rated 1 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

Was this helpful?

Review posted

Reviewed by Stephanie L.

Verified Buyer

Reviewing

Super Leakproof® No-Show Underwear Bikini

Pant Size

Teen 00-2

Size Purchased

Usage

Primary Protection

Rated 5 out of 5

Gymnastics

My daughter was able make it through a 3 hour gymnastics meet without needing to go to the bathroom worried about a leak! Prancing around in her skimpy leotard worry free! No leaks and couldn't tell she was wearing underwear! LOVE these!

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

Was this helpful?

KT Size	Hips	Kids Pant Size	Adult Pant Size
XXS	25” - 27”	7	---
XS	28” - 30”	8 - 10	---
S	31” - 34”	12 - 14	00 - 2
M	35” - 38”	16 - 20	4 - 8
L	39” - 42”	---	10 - 14
XL	43” - 46”	---	16 - 18
XXL	47” - 50”	---	20 - 22

KT Size	Band	Hips	Kids Pant Size	Adult Pant Size
XXS	23 ³/₄" - 25 ¹/₄"	25” - 27”	7	---
XS	25 ¹/₄" - 26 ³/₄"	28” - 30”	8 - 10	---
S	26 ³/₄" - 28 ¹/₄"	31" - 34"	12 - 14	00 - 2
M	28 ¹/₄" - 29 ³/₄"	35” - 38"	16 - 20	4 - 8
L	29 ³/₄" - 31 ¹/₂"	39” - 42”	---	10 - 14
XL	31 ¹/₂" - 33 ¹/₂"	43” - 46”	---	16 - 18
XXL	33 ¹/₂" - 35 ¹/₂"	47” - 50”	---	20 - 22

KT Size	Hips	Kids Pant Size	Adult Pant Size
XXS	25” - 27”	7	---
XS	28” - 30”	8 - 10	---
S	31” - 34”	12 - 14	00 - 2
M	35” - 38”	16 - 20	4 - 8
L	39” - 42”	---	10 - 14
XL	43” - 46”	---	16 - 18
XXL	47” - 50”	---	20 - 22

KT Size	Band	Hips
XS	28"	25” - 27”
S	30"	28” - 30”
M	32"	31” - 35”
L	34"	36” - 40”
XL	36"	41” - 44”
XXL	38"	45” - 48”

Size	Bust	Hips
XS	27”	25" - 27"
S	30”	28" - 30"
M	34"	31" - 35"
L	37”	36" - 40"
XL	40”	41" - 44"
XXL	40”	45" - 48"

Size	Hips	Height	Weight
XS/S	25" - 30"	4'2" - 5'1"	65 - 100 lbs
M/L	31" - 40"	4'9" - 5'6"	105 - 130 lbs
XL/XXL	41" - 48"	4'11" - 5'6"	135 - 170 lbs