Leakproof UltraThin No-Show Bikini
Mix & Match: Buy 3+ Save 10%, Buy 6+ Save 20%
• 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.
🇺🇸 Free standard shipping over $100*.
Free expedited shipping over $150*. Duty-free. (after discounts, before shipping + taxes)
Within 30 days of delivery, you may exchange for another size, style or store credit. We’re unable to provide refunds on underwear.
- Jamie18 hours agoRated 5 out of 5 stars5 Stars
I’m happy with the product. The shipping time was reasonable too!
Was this helpful? - Marcy P.Verified Buyer4 days agoRated 5 out of 5 starsLeakproof Ultra Thin Bikini
These are great! Was able to retire adding the pads - and no panty lines!
ComfortRated 4.0 on a scale of 1 to 5Poor ExcellentEffectivenessRated 4.0 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? - NatalieVerified Buyer4 days agoRated 5 out of 5 starsBeautiful colors and great quality
I definitely agree to size up when it comes to the underwear. I only use them at night, so I can't confirm if they work to the same degree of absorbency during the day as tampons or pads
However, they are very comfortable and nothing leaked overnight. I also appreciate a nice variety of colors for all levels of absorbency.
ComfortRated 5.0 on a scale of 1 to 5Poor ExcellentEffectivenessRated 5.0 on a scale of 1 to 5Poor ExcellentSizingRated -1.0 on a scale of minus 2 to 2Runs Small True to Size Runs LargeWas this helpful?
How to wash
Machine Washable: Wash with like colors, cold setting with mild detergent, do not bleach, iron, or dry clean.
Always refer to our Fabric & Care section for best drying practices.
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.
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!
Leakproof covers you for all of life’s leaks, like periods (including your heaviest flows), sweat, light bladder leaks, postpartum, and discharge.