UltraThin Leakproof Underwear

*Offer valid on select underwear styles on knix.com and knix.ca, while supplies last. When you purchase three or more eligible styles from the same category, you’ll receive the corresponding offer:

• Light: 3 for $60

• Heavy: 3 for $75

• Overnight: 3 for $99

Exclusions: Sale items, Leakproof CoreLove High Rise, Leakproof Modal Rib Boxer Brief, Luxe Modal Leakproof Sleep Boxer, Leakproof Cotton Modal Bikini, Leakproof Cotton Modal High Rise, all Thigh Saver styles.

Discount is automatically applied at checkout and is based on eligible items in your order. No rain checks or price adjustments on previous purchases.

Our Leakproof technology features a built-in absorbent liner. Depending on the style you choose, the absorbency can range from about 1-17 tsp of liquid. The result? Confident protection from sweat, discharge, periods, and light bladder leaks.

*Period underwear and pads are exempt from federal sales tax in Canada. They are also exempt from most provincial / harmonized sales taxes. But are subject to the following provincial sales tax rates which will apply to orders shipped to the following provinces and to orders purchased in retail stores located in the following provinces: British Columbia and Manitoba: 7% PST; Saskatchewan: 6% PST. 

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A gusset is essentially a liner. It’s where you’ll find our leakproof technology. It’s built into the crotch section of the underwear.