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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10k+ 5-star reviews

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Leakproof Cotton Underwear Bikini

Moderate Absorbency

$23 ^CAD Buy More Save More

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Light Leakproof No-Show Underwear Boyshort

Light Absorbency

$22 ^CAD Buy More Save More

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Leakproof UltraThin No-Show Thong

Light Absorbency

$25 ^CAD Buy More Save More

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Light Leakproof No-Show Underwear Bikini

Light Absorbency

$22 ^CAD Buy More Save More

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Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

$29 ^CAD Buy More Save More

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Sleep through the night, even on your heaviest days

Leak-proof, comfortable overnight period underwear trusted by 10,000+ 5-star reviewers.

Sleep through the night, even on your heaviest days

Leak-proof, comfortable overnight period underwear trusted by 10,000+ 5-star reviewers.

Top-Rated by Customers

Heaviest Absorbency Yet

Super Leakproof® Sleepover Boxer

Heavy Absorbency

$45 ^CAD Buy More Save More

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Best Seller

Period Swim Sport One-Piece

Moderate Absorbency

$99 ^CAD New Colors

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Super Leakproof® Sleepover Short

Heavy Absorbency

$45 ^CAD Buy More Save More

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FULL COVERAGE

Period Swim Full-Coverage Bikini Bottom

Moderate Absorbency

$55 ^CAD New Colors

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SELLING FAST

Leakproof UltraThin No-Show Underwear Boyshort 3-Pack

Moderate Absorbency

$65 ^CAD $75 New Colors

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Period Swim Bikini Bottom

Moderate Absorbency

$55 ^CAD New Colors

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SELLING FAST

Light Leakproof No-Show Underwear Bikini 3-Pack

Light Absorbency

$60 ^CAD $66 New Colors

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Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

$29 ^CAD Buy More Save More

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Free Shipping Over $80

New & improved heavy period protection

Our bestselling Super Leakproof® underwear is redesigned with improved leakproof layers for maximum protection and all-day or all-night comfort.

New & improved heavy period protection

Our bestselling Super Leakproof® underwear is redesigned with improved leakproof layers for maximum protection and all-day or all-night comfort.

Proudly Canadian

Buy 3+ & Save

Super Leakproof® No-Show Underwear Bikini

Heavy Absorbency

$29 ^CAD Buy More Save More

View

Light Leakproof No-Show Underwear Bikini

Light Absorbency

$22 ^CAD Buy More Save More

View

Leakproof UltraThin No-Show Underwear Bikini

Moderate Absorbency

$25 ^CAD Buy More Save More

View

Leakproof Cotton Underwear Bikini

Moderate Absorbency

$23 ^CAD Buy More Save More

View

Super Leakproof® No-Show Underwear Boyshort

Heavy Absorbency

$29 ^CAD Buy More Save More

View

Leakproof UltraThin No-Show Thong

Light Absorbency

$25 ^CAD Buy More Save More

View

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.

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”

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

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

Size

Under Bust (in)

Fits Cups

26 3/4” - 28 1/4”

A-DD

28 1/4” - 29 3/4”

A-DD

29 3/4” - 31 1/2”

A-DD