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10k+ 5-star reviews

10k+ 5-star reviews

10k+ 5-star reviews

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10k+ 5-star reviews

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10k+ 5-star reviews

Everyone’s switching to period undies

2 million+ people are ditching the waste from disposables and anxiety about leaks. Period Undies are seamless, comfy, and built with a hidden liner.

Everyone’s switching to period undies

2 million+ people are ditching the waste from disposables and anxiety about leaks. Period Undies are seamless, comfy, and built with a hidden liner.

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First Pair Risk-Free

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Top Gifts for Teens

Heaviest Absorbency Yet

Super Leakproof® Sleepover Boxer

Heavy Absorbency

$45 ^USD Back in Stock

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GIFT-BOXED & READY TO GIVE

Leakproof UltraThin Bikini Holiday 3-Pack

Moderate Absorbency

$65 ^USD $72

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Super Leakproof® Sleepover Short

Heavy Absorbency

$45 ^USD 2 for $39 EACH

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Super Leakproof® No-Show Underwear Boyshort 3-Pack

Heavy Absorbency

$75 ^USD $81 Save up to 10% off

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Period Swim Sport One-Piece

Moderate Absorbency

$88 ^USD New Colors

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Seamless pullover style

On-The-Daily Bra

$35 ^USD New

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The gift of stress-free periods

Find self-care must-haves for every teen on your list: period undies, sleep gifts, stocking stuffers, and more feel-good favorites.

The gift of stress-free periods

Find self-care must-haves for every teen on your list: period undies, sleep gifts, stocking stuffers, and more feel-good favorites.

Machine Washable

Machine Washable

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New Arrivals

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Super Leakproof® Sleepover Short

Heavy Absorbency

$45 ^USD 2 for $39 EACH

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Leakproof UltraThin No-Show Underwear Bikini 3-Pack

Moderate Absorbency

From $59 ^USD $72 Save up to 15% off

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Super Leakproof® No-Show Underwear Bikini 3-Pack

Heavy Absorbency

From $75 ^USD $81 Save up to 10% off

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Leakproof UltraThin No-Show Thong

Light Absorbency

From $24 ^USD 3+ for $21.67 EACH

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Seamless pullover style

On-The-Daily Bra

From $35 ^USD New

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Period Swim Sport One-Piece

Moderate Absorbency

From $88 ^USD New Colors

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Period Swim Full-Coverage Bikini Bottom

Moderate Absorbency

From $45 ^USD New Colors

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Leakproof Luxe Modal Sleep Boxer

Moderate Absorbency

From $34 ^USD

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Racerback Tankini Swim Top

From $45 ^USD New Style

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Every period need. Covered in a kit.

Kits designed to prep for first periods, heavy flows and everything in between.

Sleepover Boxer looks great on you

Our community is loving the Sleepover Boxer. Good thing we just restocked. Get yours before it sells out again.

Every period need. Covered in a kit.

Kits designed to prep for first periods, heavy flows and everything in between.

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Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

$27 ^USD 3+ for $25 EACH

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Light Leakproof No-Show Underwear Boyshort

Light Absorbency

$22 ^USD 3+ for $20 EACH

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Leakproof UltraThin No-Show Thong

Light Absorbency

From $24 ^USD 3+ for $21.67 EACH

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Super Leakproof® No-Show Underwear Boyshort

Heavy Absorbency

From $27 ^USD 3+ for $25 EACH

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Leakproof UltraThin No-Show Underwear Bikini

Moderate Absorbency

From $24 ^USD 3+ for $21.67 EACH

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Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

From $27 ^USD 3+ for $25 EACH

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Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

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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.