Up to 60% off sitewide! Get your picks before they sell out. (Shop Sale)

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Biggest sale of the year

Period Undies. Swim. Active. Get your picks before they sell out!

Biggest sale of the year

Period Undies. Swim. Active. Get your picks before they sell out!

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FREE SHIPPING OVER $70

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FREE SHIPPING OVER $70

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FREE SHIPPING OVER $70

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FREE SHIPPING OVER $70

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FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Image of a chrome heart surrounding text

FREE SHIPPING OVER $70

Undies Starting at $12

+3

Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

From $12 ^USD $27 UP TO 50% OFF

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+3

Light Leakproof No-Show Underwear Boyshort

Light Absorbency

From $12 ^USD $22 UP TO 40% OFF

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+2

Leakproof UltraThin No-Show Underwear Bikini

Moderate Absorbency

From $12 ^USD $24 UP TO 50% OFF

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Leakproof Cotton Underwear Bikini

Moderate Absorbency

From $15.40 ^USD $22 30% OFF

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+3

Super Leakproof® No-Show Underwear Boyshort

Heavy Absorbency

From $12 ^USD $27 UP TO 50% OFF

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Leakproof UltraThin No-Show Thong

Light Absorbency

From $14.40 ^USD $24 UP TO 40% OFF

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+2

Leakproof UltraThin No-Show Underwear Boyshort

Moderate Absorbency

From $12 ^USD $24 UP TO 50% OFF

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+3

Light Leakproof No-Show Underwear Bikini

Light Absorbency

From $12 ^USD $22 UP TO 40% OFF

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SAVE BIG on period undies

Every pair for every flow is on sale. This almost never happens.

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Every pair for every flow is on sale. This almost never happens.

Machine Washable

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Top Sale Picks

+8
+4

Super Leakproof® Sleepover Short

Heavy Absorbency

From $27 ^USD $45 UP TO 40% OFF

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+3

Period Swim Sport One-Piece

Moderate Absorbency

From $35.20 ^USD $88 UP TO 60% OFF

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+4

Super Leakproof® No-Show Underwear Bikini 3-Pack

Heavy Absorbency

From $45 ^USD $81 UP TO 40% OFF

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GIFT-BOXED & READY TO GIVE

Leakproof UltraThin Bikini Holiday 3-Pack

Moderate Absorbency

From $45.50 ^USD $72 UP TO 40% OFF

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Seamless pullover style

On-The-Daily Bra

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+4

Light Leakproof No-Show Underwear Bikini 3-Pack

Light Absorbency

From $36 ^USD $66 UP TO 40% OFF

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Absorbs 3-6 tsp

Leakproof Active Short

Moderate Absorbency

From $15.20 ^USD $38 UP TO 60% OFF

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SAVE BIG on period swim

Stop period anxiety with the viral period protection swimsuits.

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

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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.