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Meet underwear built for real life. Leakproof protection for periods, bladder leaks, sweat & discharge — plus everyday essentials. Sizes XS–4X.

Kits & Packs

Ultra

Absorbs 7-11 super tampons

Heavy

Absorbs 4-7 super tampons

Moderate

Absorbs 2-4 super tampons

Light

Absorbs 1-3 regular tampons

Essential

No absorbency

Buy 3+ get 15% off Buy 5+ get 20% off

Restocked

Your underwear questions, answered.

What is your First Pair Risk Free for 30 Days Guarantee?

Leakproof Underwear, Risk Free

Trying leakproof underwear for the first time? Your first pair is completely risk free for 30 days. Wear them, wash them, and see how they work for your body. If they’re not right for you, we’ll refund your first pair. Prefer a different size or style? We also offer free exchanges.
How it works:
* Risk free applies to leakproof underwear on your first order
* Refund covers the item price (original shipping excluded)
* Just email info@knix.com and we’ll take care of you

How do I find out my absorbency level?

Are Leakproof products tax-free?

Which styles have more front or back coverage?

Coverage at Knix comes in all shapes and sizes. If we’re talking about silhouettes, we go all the way from thongs to boxers.

We also offer high rise styles, like the Leakproof UltraThin No-Show High Rise, that sits just above the natural waist and gives full coverage through the stomach, hip & bum.

For extra liner coverage, look for undies that have an “extra-long liner” (usually 10”-14”), like in our Super Leakproof® Dream Short™ and our new SuperPlus Leakproof® Collection with our longest front-back-liner.

Have a suggested style or coverage? Just let us know. We love the feedback!

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Super Leakproof® Dream Boxer™

Leakproof UltraThin No-Show Bikini

Super Leakproof® Dream Short™

Super Leakproof® Mini Dream Boxer

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Super Leakproof® Mini Dream Boxer

SuperPlus Leakproof® Dream Short

Leakproof UltraThin No-Show Bikini

Super Leakproof® Dream Boxer™

Leakproof UltraThin No-Show High Rise

SuperPlus Leakproof® No-Show High Rise

Super Leakproof® Dream Short™

Light Leakproof UltraThin No-Show Thong

The Full Cycle Kit - High Rise

Super Leakproof® Dream Team 2-Pack

High Rise Underwear

SuperPlus Leakproof® No-Show High Rise

Super Leakproof® No-Show High Rise

Leakproof UltraThin No-Show High Rise

Light Leakproof No-Show High Rise

Super Leakproof® Cotton High Rise

Leakproof CoreLove High Rise

Essential No-Show High Rise

Essential No-Show High Rise Thong

Essential Full Mesh High Rise

Essential No-Show High Rise 5-Pack

Leakproof UltraThin No-Show High Rise 3-Pack

Bikini Underwear

SuperPlus Leakproof® No-Show Bikini

Super Leakproof® No-Show Bikini

Super Leakproof® Cotton Bikini

Leakproof UltraThin No-Show Bikini

Light Leakproof No-Show Bikini

Light Leakproof No-Show Bikini 3-Pack

Essential No-Show Bikini

Essential No-Show Bikini 5-Pack

Essential Full Mesh Bikini

Leakproof UltraThin No-Show Bikini 3-Pack

French Cut Underwear

Super Leakproof® No-Show French Cut

Leakproof UltraThin No-Show French Cut

Light Leakproof No-Show French Cut

Essential No-Show French Cut

Essential Full Mesh French Cut

Thong Underwear

Super Leakproof® No-Show Thong

Light Leakproof UltraThin No-Show Thong