Period Underwear

Mix, Match & Save - Terms & Conditions

*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 & Essential: 3 for $60
- Moderate & Heavy: 3 for $75
- Ultra: 3 for $99

Exclusions: Super Leakproof Dream Short, Super Leakproof Dream Boxer, 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 and Last Call items.

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

What is Leakproof technology and how does it work?

Are Leakproof products tax-free?

*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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What’s a gusset?

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 Dream Short and the new SuperPlus leakproof with our longest front-back-liner.

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

What can Leakproof underwear be used for?

How do I find out my absorbency level?

Do I need to wear a pad or tampon with Leakproof underwear?

Totally up to you. All of our absorbencies have been wear tested and lab tested, but some people prefer to wear one for their own comfort levels. Others have tried Leakproof Underwear throughout their cycle and know the right pair for every leak. Our advice? Do what makes you feel most confident.

How do I wash Leakproof underwear?

We designed our products to be super easy to wash and care for. For best results, rinse with cold water first, then machine wash period panties on a cold cycle with mild detergent. It’s that easy! Different styles have different drying instructions, so always be sure to check. Pro tips: Don’t use softener or bleach, and never iron.

How many pairs do I need for a cycle?

That depends on you and your flow. And remember: everyone’s flow is different.

We suggest getting used to Leakproof Underwear like you would with any other leak protection. That might mean wearing your first pair at night or while you’re hanging out at home, just so you can get a better sense of your flow and your absorbency needs.

When you’re wearing your undies throughout your cycle, you can change them on your flow and the absorbency of the pair. For example, some people on their medium flow days wear one pair of UltraThin for their work day, then switch to another pair when they get home in the early evening.

For quick reference: Styles like our Ultra Leakproof Zones + Underwear are great for your heaviest flows days. Our Light Leakproof No-Show Bikini, is a great option for those days of spotting and our Super Leakproof No-Show High Rise is a great option for heavier days.

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Period Underwear