Leakproof Underwear

Shop the most absorbent, machine-washable, and comfortable leakproof period underwear. And enjoy worry-free protection from periods, pee, and sweat.

Leakproof Boyshort
Medium Absorbency
Buy 3 Save 25% $23 USD
Rated 4.7 out of 5
2171 Reviews
Leakproof Thong
Light Absorbency
Buy 3 Save 25% $23 USD
Rated 4.7 out of 5
771 Reviews
Leakproof Cheeky
Medium Absorbency
Buy 3 Save 25% $23 USD
Rated 4.7 out of 5
348 Reviews
Leakproof High Rise Thong
Light Absorbency
Buy 3 save 25% $28 USD
Rated 4.7 out of 5
128 Reviews
Knixy Lace Leakproof High Rise
Medium Absorbency
Buy 3 save 25% $28 USD
Rated 4.9 out of 5
251 Reviews
Knixy Lace Leakproof Bikini
Medium Absorbency
Buy 3 save 25% $23 USD
Rated 4.8 out of 5
300 Reviews
Knixy Lace Leakproof Thong
Light Absorbency
Buy 3 save 25% $23 USD
Rated 4.8 out of 5
122 Reviews

Period Underwear - Because We Bleed

Stop relying on disposables and switch to beautiful, reusable, and comfortable period underwear. Whether you have a light flow or a heavy flow, we’ve designed protection that’s there for you throughout your whole cycle.

Stop relying on disposables and switch to beautiful, reusable, and comfortable period underwear. Whether you have a light flow or a heavy flow, we’ve designed protection that’s there for you throughout your whole cycle.

Incontinence Underwear - Sometimes We Pee A Little

Sneeze, jump, or giggle without a care! Knix leakproof undies were created so you can get back to enjoying life and not worry about light bladder leaks.

Sneeze, jump, or giggle without a care! Knix leakproof undies were created so you can get back to enjoying life and not worry about light bladder leaks.

Sweat-Proof Underwear - Perfect for the Gym

Stay fresh and dry during your sweatiest of sweat sessions with our moisture-wicking, anti-odor and quick dry technology. And seamless design makes them invisible under leggings. Win, win.

Stay fresh and dry during your sweatiest of sweat sessions with our moisture-wicking, anti-odor and quick dry technology. And seamless design makes them invisible under leggings. Win, win.

It's time to switch to Leakproof Underwear

Knix Leakproof Period Underwear FAQs

Super Leakproof Technology