Athletic Leakproof Boyshort

High-performance underwear with an ultra-thin panty liner that absorbs up to 2 tampons (3tsp) of liquid. Our best period underwear are also great protection against little leaks. (We also make leakproof for teens - Click here for Knixteen)

Classic Colours
Questions & Answers

Leakproof Essentials

Sometimes you need your underwear to step up. We've engineered ours to do just that.
Super Absorbent
Leakproof technology absorbs up to two tampons worth of liquid.
Quick Dry Gusset
Dries 2-3 times faster than regular cotton and carbon cotton helps eliminate odor.
Seamless Construction
Sits flat against your skin to eliminate panty lines and for superior comfort.
"Best undies ever! Comfortable and do exactly what they say they will!"

– Holly O.

Read More Reviews


Period underwear for teens. Same great leakproof technology, now available in sizes for tweens and teens!

How It Fits

Extra coverage through the hip and bum, and sit slightly higher than our bikini silhouette. The stretch tech means these will relax a bit more than the Everyday line.


Body: 77% nylon, 23% LYCRA®
Gusset Liner: 86% cotton, 10% spandex, 4% carbon
Gusset: Fresh Fix Technology®


Machine wash cold with mild detergent, do not bleach, lay flat to dry.

They work great for LBL caused by running and are fantastic on lite period days.
Jennifer S.

What You're Wearing


Constructed using 4-way stretch fabrics, your Knix match your every move and mold to your unique shape. It's comfort unlike anything.


Knix products are tested by 1000s of women to ensure they're ready for real life. And everything that comes with it.


Moisture-wicking. Anti-odor. Quick dry. And anything else we can do to improve your intimates.

Athletic Leakproof Boyshort Reviews

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Athletic Leakproof Boyshort
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