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10k+ 5-star reviews

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Long Weekend Stock-Up & Save

Buy 3+ underwear and save 20%. This weekend only—ends Monday at 11:59pm. Discount applied at checkout.

Long Weekend Stock-Up & Save

Buy 3+ underwear and save 20%. This weekend only—ends Monday at 11:59pm. Discount applied at checkout.

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Leakproof Cotton Underwear Bikini

Moderate Absorbency

$22 ^USD Buy More Save More

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+1

Leakproof UltraThin No-Show Underwear Boyshort

Moderate Absorbency

$24 ^USD Buy More Save More

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+1

Leakproof UltraThin No-Show Thong

Light Absorbency

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+4

Light Leakproof No-Show Underwear Bikini

Light Absorbency

$22 ^USD Buy More Save More

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+1

Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

$27 ^USD Buy More Save More

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1 in 2 teens misses out on swimming because of their period

Period swim keeps them active without having to worry about excuses to sit out, intimidating tampons, or embarrassing period leaks.

1 in 2 teens misses out on swimming because of their period

Period swim keeps them active without having to worry about excuses to sit out, intimidating tampons, or embarrassing period leaks.

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

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Machine Washable

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Machine Washable

Machine Washable

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Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

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Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

Machine Washable

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+1

Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

$27 ^USD Buy More Save More

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+4

Light Leakproof No-Show Underwear Bikini

Light Absorbency

$22 ^USD Buy More Save More

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+3

Leakproof UltraThin No-Show Underwear Bikini

Moderate Absorbency

$24 ^USD Buy More Save More

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+5
+1

Light Leakproof No-Show Underwear Boyshort

Light Absorbency

$22 ^USD Buy More Save More

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Leakproof Cotton Underwear Bikini

Moderate Absorbency

$22 ^USD Buy More Save More

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+1

Super Leakproof® No-Show Underwear Boyshort

Heavy Absorbency

$27 ^USD Buy More Save More

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+3

Leakproof UltraThin No-Show Underwear Bikini

Moderate Absorbency

$24 ^USD Buy More Save More

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Read The Rag

Free Period Guide

Everything your teen ever wanted to know about puberty, menstruation, and more.

Download the Guide

“With this new line, teens can lean into that life well lived from their very first period”

"KT by Knix is aimed at both helping teen girls deal with the reality of periods"

“KT by Knix products are simple and easy to use — you can wear them under absolutely anything”

Teen Underwear Size Chart

KT Period Underwear is designed for smaller and growing bodies to fit teens and tweens

For adult sizes and styles, check out Knix .

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

Find the Perfect Fit

1. Hips

Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.

Still Not Sure What Size To Get?

Book a Virtual Fitting with a team member and get 1:1 help over video chat.

Teen Swimwear Size Chart

KT swimsuits are designed for smaller and growing bodies to fit teens and tweens

For adult sizes and styles, check out Knix .

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

Find the Perfect Fit

1. Band

First, measure around the torso right below the breast

2. Hips

Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.

Still Not Sure What Size To Get?

Book a Virtual Fitting with a team member and get 1:1 help over video chat.

Teen Activewear Size Chart

KT activewear is designed for smaller and growing bodies to fit teens and tweens

For adult sizes and styles, check out Knix .

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

Find the Perfect Fit

1. Hips

Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.

Still Not Sure What Size To Get?

Book a Virtual Fitting with a team member and get 1:1 help over video chat.

Teen Leotard Size Chart

KT leotards are designed for smaller and growing bodies to fit teens and tweens

For adult sizes and styles, check out Knix.

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”

Find the Perfect Fit

1. Band

First, measure around the torso right below the breast

2. Hips

KT Leotards are designed to sit on the hips, so measure around the widest part of the hips and refer to the chart above to find the best fit.

Still Not Sure What Size To Get?

Book a Virtual Fitting with a team member and get 1:1 help over video chat.

Teen Sweatshirt Size Chart

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"

Still Not Sure What Size To Get?

Book a Virtual Fitting with a team member and get 1:1 help over video chat.

Freestyle Leakproof Tights Size Chart

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

Still Not Sure What Size To Get?

Book a Virtual Fitting with a team member and get 1:1 help over video chat.

Thigh Savers Size Chart

KT Products are designed for smaller and growing bodies to fit teens and tweens

For adult sizes and styles, check out Knix .

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

Find the Perfect Fit

1. Hips

Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.

Still Not Sure What Size To Get?

Book a Virtual Fitting with a team member and get 1:1 help over video chat.

Bras Size Chart

KT Products are designed for smaller and growing bodies to fit teens and tweens

For adult sizes and styles, check out Knix .

Size	Under Bust (in)	Fits Cups
S	26 3/4” - 28 1/4”	A-DD
M	28 1/4” - 29 3/4”	A-DD
L	29 3/4” - 31 1/2”	A-DD