Light Leakproof No-Show Underwear Bikini - Last Call

Name: Light Leakproof No-Show Underwear Bikini - Last Call
Brand: Knixteen
SKU: KT113UCXXS
Price: 7.6 USD
Availability: InStock
Rating: 4.5 (290 reviews)

like your comfiest underwear, but with the power of 3 tampons.

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Quick Facts

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.

Details

Whether you’re training hard or just hanging out, these period undies protect you against sweat, discharge and leaks. A classic silhouette made from soft, stretchy, quick-drying fabric, you’ll have the comfort of maximum movement, and the confidence of reliable protection.

First layer: 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 tampons or pads.

Key Features:

- Quick-Drying

- Moisture and Sweat Wicking

- 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: 77% Nylon, 23% Xtra Life Lycra

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

Gusset: Fresh Fix Technology®

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.

Medium Absorbency

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

Lightest 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 lightest, medium 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 4.5 out of 5

Based on 290 reviews

5 Stars

226 Reviews
4 Stars

27 Reviews
3 Stars

10 Reviews
2 Stars

10 Reviews
1 Star

17 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
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 Rebecca R.

Verified Buyer

Reviewing

Light Leakproof No-Show Underwear Bikini

Pant Size

Kids 12-14

Size Purchased

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!

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

Was this helpful?

Review posted

Reviewed by Cindy M.

Verified Buyer

Reviewing

Light Leakproof No-Show Underwear Bikini

I'm a...

Adult

I purchased for...

Myself

Pant Size

Teen 18-20

Size Purchased

Rated 5 out of 5

The most comfortable underwear you can buy!

Exactly what you need in the most comfortable underwear. The leakproof panel will give anyone reassurance and confidence at any time of the month.

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 Lacey R.

Verified Buyer

Reviewing

Light Leakproof No-Show Underwear Bikini

I'm a...

Parental Figure

I purchased for...

A Teenager/Tween

Pant Size

Kids 8-10

Size Purchased

Rated 5 out of 5

Excellent

Work well

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

Was this helpful?

Review posted

Reviewed by Clarissa S.

Verified Buyer

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

Usage

Back-up Protection

Rated 5 out of 5

The best

This is the only style my daughter likes. Will be ordering more.

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 Starr C.

Verified Buyer

Reviewing

(closed) Light Leakproof No-Show Underwear Bikini

I'm a...

Parental Figure

I purchased for...

A Teenager/Tween

Pant Size

Teen 12-16

Size Purchased

Usage

Period

Rated 5 out of 5

Pretty little stars

My teen loved the little star design, and uses these on her light days.

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