10K+ ★★★★★ 5-star reviews
Period protection that looks and feels like underwear. Period protection that looks and feels like underwear.
Periods can already come with enough questions.
When is it coming? Was it a leak?
Leakproof Underwear helps take some of those questions off her mind.
She puts them on. The protection is already there. So she can focus on everything else.
Less checking. More learning, laughing and living.
Long classes. Bathroom lineups. Surprise periods. Sitting for hours and wondering if she leaked.
Leakproof protection stays with her throughout her day, so she can feel more prepared; even when her period isn't predictable yet.
Her period doesn't get to decide whether she plays.
Run. Jump. Dance. Stretch. Practice.
Leakproof Underwear moves with her body without a pad shifting around underneath her.
Because getting her period shouldn't mean sitting this one out.
Protection that keeps working while she keeps sleeping.
Periods don't stop at bedtime — and sleeping shouldn't mean worrying about waking up to stained pajamas or sheets.
Our higher-absorbency Leakproof styles give her built-in protection designed for longer wear and overnight coverage.
Ready before her period is.
Especially in the first few years, periods aren't always predictable.
Leakproof Underwear can be worn just like regular underwear on days when she thinks her period might come — so the protection is already there if it does.
No emergency pad. No rush to the bathroom. No surprise stain.
Different days need different absorbency.
LIGHT
For lighter days, spotting and everyday backup.
MODERATE
For regular-flow days and added protection.
SUPER
For heavier days when she needs more absorbency.
SUPER+ / OVERNIGHT
Our highest levels of protection for heavy-flow days and sleeping.
Yes, they're reusable.
WEAR IT
Choose the absorbency that works for her day.
WASH IT
After wearing, machine wash according to the care instructions.
WEAR IT AGAIN
No disposable pad to replace every time she wears them.
Period protection becomes part of her underwear drawer instead of another thing she has to remember.
Over 2M+ pairs sold prove it.
Kt Period Undies don’t just work—they work better than you’d expect. Washable, discreet, and super comfy, our undies keep you feeling fresh and confident. So tell your tween to RSVP yes to that sleepover and wear that white tennis skirt. She's covered.
Top Picks for Dancers
Shop All
Save 25% on the First Period Kit
This is the perfect kit to get your teen ready for their first period, featuring everything they need for their lightest days and heaviest nights. Our signature buttery-soft fabric is designed to be invisible under clothing, including leggings, so they don't need to worry about panty lines.