Astrology Collection Leakproof UltraThin Bikini
30% off
Astrology Collection Leakproof UltraThin Bikini
30% off
Knix period underwear and pads are now sales tax-free in Canada.* We celebrate improvements to the accessibility and affordability of essential period care products.
The very latest in leakproof innovation – get more absorbency without any extra bulk! Features an ultra-thin liner that absorbs the same as about 2.5 super tampons, and 360LeakSeal™ technology that locks in leaks at every edge. You get the protection you want from periods and light bladder leaks, so you can feel super comfy and worry-free every single day of the month.
Plus, we've added our logo to the liner, so you can tell the difference between these pairs and our lighter leakproof underwear.
• Classic mid-rise silhouette
• Medium hip & bum coverage
• Ultra-thin, built-in liner
• Absorbs about 2.5 super tampons’ worth of liquid
• Quick dry gusset
• Soft, stretchy PerformaStretch® fabric
• Conforms to your body
The fabric is designed to feel snug at first but relax with wash and wear for a perfect fit.🇨🇦 Free standard shipping over $100.
Free expedited shipping over $150.
(after discounts, before shipping + taxes) All items ship from within Canada.
EXCHANGE ONLY Items on sale during our Anniversary Sale are exchange only. For items with a 20% or more discount you may exchange for another item or store credit. No refunds.
Our Absorbency Guide
Your leakproof questions, answered.
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.
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 our Ultra Zones+ also have full bum coverage, too.
Have a suggested style or coverage? Just let us know. We love the feedback!
- JillianVerified BuyerYesterdayRated 5 out of 5 starsOut of this world
Thin has reached a new level. So comfortable you don't even realize they are period underwear.
ComfortRated 5.0 on a scale of 1 to 5Poor ExcellentEffectivenessRated 5.0 on a scale of 1 to 5Poor ExcellentFitRated 0.0 on a scale of minus 2 to 2Runs Small True to Size Runs LargeEase of UseRated 5.0 on a scale of 1 to 5Poor ExcellentWas this helpful? - Traci3 days agoRated 5 out of 5 stars5 Stars
Always love the quality and fit of Knix underwear.
Was this helpful? - Elaine F.Verified Buyer1 week agoRated 5 out of 5 starsSuper comfy undies
These were my free birthday undies but I already own many pairs of Knix underwear so getting the zodiac design free for my birthday is a great bonus. Great Canadian company, super fast shipping, great loyalty program.
ComfortRated 5.0 on a scale of 1 to 5Poor ExcellentEffectivenessRated 4.0 on a scale of 1 to 5Poor ExcellentFitRated 1.0 on a scale of minus 2 to 2Runs Small True to Size Runs LargeEase of UseRated 5.0 on a scale of 1 to 5Poor ExcellentWas this helpful?