Underwear

Get into undies that make you feel unstoppable. From ultra-soft fabrics and seamless styles to super absorbent period and incontinence underwear, you’re covered 24/7/365.

Knix Underwear FAQs

Super Absorbency
A total replacement for disposable period products - absorbs approximately 8 tsp, 40 ml, or the equivalent of 8 regular tampons worth of liquid.

High Absorbency
Ready to stop leaks whenever - absorbs approximately 4-6 tsp, 20-30 ml, or the equivalent of 4-6 tampons worth of liquid.

Medium Absorbency
Confident backup protection for heaviest days - absorbs approximately 3 tsp, 15 ml, or the equivalent of 2 tampons worth of liquid.

Light Absorbency
Protection for your lighter days - absorbs approximately 1 tsp, 5 ml, or the equivalent of 1 tampons worth of liquid.

Leakproof Bundle is 3 pairs of underwear for $60 USD and eligible items for this offer are: Leakproof Thong, Leakproof Boyshort, Leakproof Bikini, Leakproof Cheeky, Leakproof High Rise, and Leakproof High Rise Thong. 

Super Leakproof Bundle is 3 pairs of underwear for $75 USD and eligible items for this offer are: Super Leakproof Thong, Super Leakproof Boyshort, Super Leakproof Bikini, Super Leakproof Cheeky, Super Leakproof High Rise, and Super Leakproof High Rise Thong. 

The Buy More Save More offer is 2 pairs of specialty underwear for $66 USD and eligible items for this offer include Full Coverage Super Leakproof Bikini, Full Coverage Super Leakproof High Rise, Super Leakproof Dreamshort, Super Leakproof Boxer Brief, and CoreLove. 

Essential Bundle is 3 pairs of underwear for $45 USD and eligible items for this offer are: Essential Thong, Essential Boyshort, Essential Bikini, Essential Cheeky, Essential High Rise, and Essential High Rise Thong. 

The minimum required units need to be met within each offer for discount to be applicable and will be automatically taken at checkout. Every additional unit above the threshold is eligible for the discounted item price. These offers are subject to change without notice, are subject to availability, and are available on knix.com and stores located in US only.

Underwear is eligible for exchange (subject to availability) or store credit only. No refunds. No price adjustments for previous orders. No rain checks. Offers only applicable on regular priced items. Knix Rewards points can be earned and redeemed with these offers.

Our Leakproof Period Underwear feature barely-there built-in panty liners that can absorb between 1 and 8 tampons worth of liquid, providing you with confident protection against period leaks, light bladder leaks, and sweat.

Our Essential Underwear feature a moisture-wicking breathable gusset that keeps sweat and odor away, but they do not provide any leakproof protection.

If you want help finding the perfect Leakproof period underwear product size for you, connect with one of our expert Knix team members for a 1-on-1 fitting session over video chat. Book a time that’s convenient for you, and we’ll walk you through everything!

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Our Cotton Modal is a fabric blend made up of naturally breathable cotton and super soft modal fabric. Modal is an eco-friendly fabric made from regenerative plants, produced using less water and fewer chemicals, with properties very similar to Cotton. While our other Leakproof Underwear are made with synthetic fabrics and are totally seamless, our Cotton Model Underwear do have some stitching.