Leakproof UltraThin No-Show Bikini
Bundle & Save: 3 for $75
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.
• Our newest leakproof innovation provides more absorbency without the bulk.
• Great for leak protection, the ultra-thin liner absorbs about the same as 2.5 super tampons or 1 regular pad’s worth.
• Our patented 360 LeakSeal™ technology locks in leaks at every edge.
• The carbon cotton gusset top layer wicks away moisture from your skin.
• These underwear feature our signature buttery soft fabric.
• No-show construction is designed to be invisible under clothes, including workout leggings.
• Machine washable just like regular underwear.
Get the protection you want from periods and light bladder leaks while feeling comfortable and worry-free.
• 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.
(after discounts, before shipping + taxes) All items ship from within Canada.
Within 30 days of delivery, you may exchange for another size, style or store credit. We’re unable to provide refunds on underwear.
Your leakproof questions, answered.
*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: 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.
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.
- Tara C.Verified BuyerHeight 5’9 – 5’11”Pant Size 4Pant Size Purchased SUsage Primary Period Protection20 hours agoHeight 5’9 – 5’11”Pant Size 4Pant Size Purchased SUsage Primary Period ProtectionRated 5 out of 5 starsComfy, absorbent
I’m very happy with these undies! They are comfortable and look seamless under my figure hugging clothes and don’t peek over the waistband of my low-rise jeans. They don’t feel like I’m wearing a diaper. They feel dry all day on my low flow days. I love a more environmentally friendly option to menstruation management. My only caveat is that for travelling, having to wash them promptly can be a bit of an inconvenience. Overall though, I highly recommend Knix panties. This style and the Super Leakproof® No-Show Boyshort are my favourite styles — I’m tall and slender with a small butt and prefer wearing form fitting dresses and low-rise pants, and these undies work well with my style.
ComfortRated 5.0 on a scale of 1 to 5Poor ExcellentEffectivenessRated 5.0 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 4.0 on a scale of 1 to 5Poor ExcellentWas this helpful? - Melissa M.Verified BuyerHeight 5’6 – 5’8”Pant Size Purchased MUsage Period Back-Up6 days agoHeight 5’6 – 5’8”Pant Size Purchased MUsage Period Back-UpRated 5 out of 5 starsSecond time ordering!
I've ordered the seamless underwear for my daughter two times! She is 16 and loves the security of the period underwear and the style of the seamless fit. Would highly recommend.
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? - Jose M.Verified BuyerPant Size 2Size Purchased SUsage Primary Period Protection1 week agoPant Size 2Size Purchased SUsage Primary Period ProtectionRated 5 out of 5 starsCustomer service!
My order got delayed/ lost. Customer rep I talked to was very understanding. Researched to see the hold up and followed up to make sure my item was received.
ComfortRated 5.0 on a scale of 1 to 5Poor ExcellentEffectivenessRated 5.0 on a scale of 1 to 5Poor ExcellentSizingRated 0.0 on a scale of minus 2 to 2Runs Small True to Size Runs LargeWas this helpful?