Best-selling kits

Snag a kit, build a stash.
Shop before the party ends.

Best-selling kits

Snag a kit, build a stash.
Shop before the party ends.

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FREE SHIPPING OVER $70

Top Sale Picks

+5
+1

Super Leakproof® Sleepover Short

Heavy Absorbency

From $23.40 ^USD $39 30-40% Off

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+1

Period Swim Sport One-Piece

Moderate Absorbency

From $58.10 ^USD 30% Off Select Colors

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Light Leakproof No-Show Underwear Boyshort 3-Pack - Clearance

Light Absorbency

From $34 ^USD $57 40% Off

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SELLING FAST

+5
+1

Leakproof UltraThin No-Show Underwear Bikini 3-Pack

Moderate Absorbency

From $34 ^USD $66 30-48% Off

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Absorbs 1-3 tsp

First Serve Sport Dress

Light Absorbency

From $59.50 ^USD $85 30% Off

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+5
+1

Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

From $11 ^USD $25 30% Off

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MAXIMUM BUM COVERAGE

+5
+1

Period Swim Short

Moderate Absorbency

From $35 ^USD 30% Off Select Colors

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40% Off

Light Leakproof No-Show Underwear Boyshort 3-Pack - Clearance

Light Absorbency

From $34 ^USD $57 40% Off

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First Serve Racerback Tank

From $31.50 ^USD $45 30% Off

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Bleed Confidence

It’s our birthday and we’re having a big sale!

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

It’s our birthday and we’re having a big sale!

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

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

REUSABLE

COMFORTABLE

ABSORBENT

Period Undies Starting at $11

SELLING FAST

+5
+1

Leakproof UltraThin No-Show Underwear Bikini 3-Pack

Moderate Absorbency

From $34 ^USD $66 30-48% Off

View

+6
+2

Light Leakproof No-Show Underwear Boyshort - Clearance

Light Absorbency

From $11 ^USD $19 40% Off

View

+4

Leakproof UltraThin No-Show Underwear Bikini

Moderate Absorbency

From $15.40 ^USD $22 30% Off

View

+5
+1

Super Leakproof® Sleepover Short

Heavy Absorbency

From $23.40 ^USD $39 30-40% Off

View

+4

Super Leakproof® No-Show Underwear Boyshort

Heavy Absorbency

From $17.50 ^USD $25 30% Off

View

Leakproof Luxe Modal Sleep Boxer

Moderate Absorbency

From $21 ^USD $30 30% Off

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For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

for this generation

For the planet

for real life

It’s our birthday. Time to celebrate

Lowest price of 2025 on Period Active. Better get to the party fast.

It’s our birthday. Time to celebrate

Lowest price of 2025 on Period Active. Better get to the party fast.

Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence Bleed Confidence

Light Flows

🩸

Absorbs light flows, sweat, and discharge.

Shop Now

Moderate Flows

🩸🩸🩸

For medium period days and sweat.

Shop Now

Heavy Flows

🩸🩸🩸🩸

Designed for heavy period days & overnight protection.

Shop Now

Free Period Guide

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

Download the Guide

@bellalogiudice

@namika_courtois

@caitlynmaile

@selenagallowayy

“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”

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