“These Are the Only Period Swimsuits You Can Trust While in the Water”

Shape Magazine loves these suits and you will too.

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FREE SHIPPING OVER $70

New Arrivals

Sunny Skies Rash Guard

$55 ^USD New Style

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Period Swim Sport One-Piece

Moderate Absorbency

$83 ^USD New Colors

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Racerback Tankini Swim Top

$45 ^USD New Style

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Period Swim Full-Coverage Bikini Bottom

Moderate Absorbency

$40 ^USD New Colors

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MAXIMUM BUM COVERAGE

Period Swim Short

Moderate Absorbency

$50 ^USD New Colors

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Square Neck Scoop Bikini Top

$45 ^USD New Colors

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10k+ 5-star reviews & counting

The numbers don't lie. This is the internet's favorite period protection.

10k+ 5-star reviews & counting

The numbers don't lie. This is the internet's favorite period protection.

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

Bundle & Save Up to 25%

Super Leakproof® Sleepover Short

Heavy Absorbency

From $23.40 ^USD Buy 4+ Save 15%, Buy 7+ Save 25%

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Super Leakproof® No-Show Underwear Boyshort

Heavy Absorbency

From $25 ^USD Buy 4+ Save 15%, Buy 7+ Save 25%

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Light Leakproof No-Show Underwear Bikini

Light Absorbency

From $19 ^USD Buy 4+ Save 15%, Buy 7+ Save 25%

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Leakproof Luxe Modal Sleep Boxer

Moderate Absorbency

From $30 ^USD Buy 4+ Save 15%, Buy 7+ Save 25%

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Leakproof Cotton Underwear Bikini

Moderate Absorbency

From $20 ^USD Buy 4+ Save 15%, Buy 7+ Save 25%

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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

Game, set, confidence

New Period Activewear helps you bring your A-game every day of the month.

Game, set, confidence

New Period Activewear helps you bring your
A-game every day of the month.

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.

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Moderate Flows

🩸🩸🩸

For medium period days and sweat.

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Heavy Flows

🩸🩸🩸🩸

Designed for heavy period days & overnight protection.

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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

Hips

Kids Pant Size

Adult Pant Size

XXS

25” - 27”

---

28” - 30”

8 - 10

---

31” - 34”

12 - 14

00 - 2

35” - 38”

16 - 20

4 - 8

39” - 42”

---

10 - 14

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

Band

Hips

Kids Pant Size

Adult Pant Size

XXS

23 ³/₄" - 25 ¹/₄"

25” - 27”

---

25 ¹/₄" - 26 ³/₄"

28” - 30”

8 - 10

---

26 ³/₄" - 28 ¹/₄"

31" - 34"

12 - 14

00 - 2

28 ¹/₄" - 29 ³/₄"

35” - 38"

16 - 20

4 - 8

29 ³/₄" - 31 ¹/₂"

39” - 42”

---

10 - 14

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

Hips

Kids Pant Size

Adult Pant Size

XXS

25” - 27”

---

28” - 30”

8 - 10

---

31” - 34”

12 - 14

00 - 2

35” - 38”

16 - 20

4 - 8

39” - 42”

---

10 - 14

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”

KT Size

Band

Hips

28"

25” - 27”

30"

28” - 30”

32"

31” - 35”

34"

36” - 40”

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

Bust

Hips

27”

25" - 27"

30”

28" - 30"

34"

31" - 35"

37”

36" - 40"

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

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

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

Hips

Kids Pant Size

Adult Pant Size

XXS

25” - 27”

---

28” - 30”

8 - 10

---

31” - 34”

12 - 14

00 - 2

35” - 38”

16 - 20

4 - 8

39” - 42”

---

10 - 14

43” - 46”

---

16 - 18

XXL

47” - 50”

---

20 - 22