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Sale

Period Underwear

Period Underwear

Period Underwear changes everything

Get period underwear from the leaders in leakproof.

Shop by Style

French Cut High Rise Bikini Boyshort Boxers & Shorts Thong Cheeky Leakproof Thigh Saver Shorts

The best thing to happen to periods ever

Imagine the confidence you’ll feel in underwear that absorbs the same as about 8 regular tampons. And they feel and wash just like regular undies.

★★★★★

“They fit perfectly AND handle my heavy days beautifully.”
Sonya S

FIND THE BEST PAIR FOR YOU

FIND THE BEST PAIR FOR YOU

Covered for everything

FIND YOUR PERFECT PAIR

✓ For light days or backup protection

✓ Full replacement of disposables on heavy days

✓ Protection day or night

✓ Save 15% on any 3+ pairs or 25% on 6+ pairs

Underwear Style

French Cut

French Cut

High Rise

High Rise

Bikini

Bikini

Boyshort

Boyshort

Shorts + Boxer Briefs

Shorts + Boxer Briefs

Leakproof Thigh Savers

Thigh Savers

Thong

Thong

Cheeky

Cheeky

“I bought 11 pairs and I’m never turning back.”

“I bought 11 pairs and I’m never turning back.”

“I bought 11 pairs and I’m never turning back.”

Sandra P.

“I haven’t felt this secure, comfortable and protected ever.”

“I haven’t felt this secure, comfortable and protected ever.”

“I haven’t felt this secure, comfortable and protected ever.”

Sheny T.

“I can’t believe I’ve gone so long without these!”

“I can’t believe I’ve gone so long without these!”

“I can’t believe I’ve gone so long without these!”

Liz

“I bought 11 pairs and I’m never turning back.”

“I bought 11 pairs and I’m never turning back.”

“I bought 11 pairs and I’m never turning back.”

Sandra P.

“I haven’t felt this secure, comfortable and protected ever.”

“I haven’t felt this secure, comfortable and protected ever.”

“I haven’t felt this secure, comfortable and protected ever.”

Sheny T.

Ways to save

Save up to 20%

Bundle & Save up to 25%

Stock up and save when you buy more pairs.
For a limited time, including Teen Underwear!

Save on Period Kits

Save on Period Kits

Skip the guesswork with curated Period Underwear Kits and save 10–15%

Earn points with Knix Rewards

Earn points with Knix Rewards

Spend $1, earn 1 point every time you shop. Redeem $10 every 100 points.

Knix Founder, Joanna Griffiths explains Period Underwear

More ways to feel unapologetically free

More ways to feel unapologetically free

More ways to feel unapologetically free

Find an amazing wireless bra to match your Undies. Plus explore our other products, all designed to make you feel so comfortable in your own skin.

BRAS Period Underwear EVERYDAY UNDERWEAR SLEEPWEAR ACTIVEWEAR APPAREL Maternity

Value Prop

Value Prop

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Best Sellers

Amber has 38" hips and wears a size M

Leakproof High Rise

Save up to 25%

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