Hey Period,
Shut Up

Period Panties
& Teen Underwear

Your New Favorite

We make bras and period underwear designed to deal with all the annoying stuff that comes with being a teen — so you can focus on being awesome.

Oh No Proof

Miracle period-proof panties that protect you from menstrual leaks, odor, and moisture. Bye bye stains; hello comfort.

Bra Bosses

Cute and comfortable teen bras that are so not boring. You’ll love them so much you won’t ever want to take them off.

Take back the bra

We worked with five of your favorite teens, including Jazz Jennings and Mo’ne Davis to design five different bras that we know you’ll love. It’s time for teens to take back the bra!

Shop Bras

Teen Period Panties

Our super protective, period-proof underwear will give you complete peace-of-mind against period leaks while at school or out with friends.

Seamless Styles

Panties built with smooth, seamless technology. All of our underwear is tested by teens and tweens, and loved by moms. Available in classic Bikini or full-coverage Boyshort style.

Moisture Absorbing

Moisture-wicking fabric means our leak proof panties absorb 1-3 tsp of liquid - that’s up to 2 tampons worth of blood - keeping you protected but still feeling dry all day.

“With this new line, teens can lean into that life well lived from their very first period”

"Knixteen is aimed at both helping teen girls deal with the reality of periods"

“Knixteen products are simple and easy to use — you can wear them under absolutely anything”

Size	Hips (in)	Hips (cm)
XS	25” - 27”	63 - 68cm
S	26” - 30”	66 - 76cm
M	31” - 35”	78 - 88cm
L	36” - 40”	91 - 101cm

Size	Band	Cup
XS	28” - 30”	A/B
S	30” - 32"	A/B
S+	30” - 32"	C/D
M	32” - 34”	A/B
M+	32” - 34”	C/D
M++	32” - 34”	DD/E
L	34” - 36”	A/B
L+	34” - 36”	C/D
L++	34” - 36”	DD/E
XL	36” - 38”	A/B

Size	Band
XS	28” - 30”
S	30” - 32"
M	32” - 34”
L	34” - 36”
XL	36” - 38”

Size	Band
XS	28” - 30”
S	30” - 32"
M	32” - 34”
L	34” - 36”
XL	36” - 38”

Size	Band	Cup
XS	28” - 30”	A/B
S	30” - 32"	A/B
S+	30” - 32"	C/D
S++	30” - 32"	DD/E
M	32” - 34”	A/B
M+	32” - 34”	C/D
M++	32” - 34”	DD/E
L	34” - 36”	A/B
L+	34” - 36”	C/D
L++	34” - 36”	DD/E
XL	36” - 38”	A/B

Hey Period, Shut Up

Period Panties & Teen Underwear