Leakproof Cotton Boybrief
Bundle & Save: 3 for $75
Leakproof Cotton Boybrief
Bundle & Save: 3 for $75
• Great for daytime protection, the ultra-thin liner absorbs about the same as 3 super tampons or 1.5 regular pads worth of liquid.
• The innovative floating gusset provides leak protection from every angle.
• The cotton-spandex blend feels luxurious against your skin.
• Certified according to OEKO-TEX® STANDARD 100, Product Class I : HK020 246396 TESTEX
• Machine washable just like regular underwear.
Get the protection you want from periods and light bladder leaks while feeling comfortable and worry-free.
• Brief shorts style
• Absorbs the same as about 3 super tampons’ worth of liquid
• Quick dry liner
• Soft, cotton-spandex blend
🇺🇸 Free standard shipping over $100*.
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.
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.
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!
- Aja3 days agoRated 5 out of 5 stars5 Stars
It’s a good fit and supportive in the days after my period.
Was this helpful? - Lisa B.Verified BuyerHeight <5’5”Pant Size Purchased XXLUsage Light Bladder Leaks4 days agoHeight <5’5”Pant Size Purchased XXLUsage Light Bladder LeaksRated 5 out of 5 starsBoybrief
very comfortable love them
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? - Amy L.Verified BuyerHeight 5’6 – 5’8”Pant Size 10Pant Size Purchased MUsage Primary Period Protection5 days agoHeight 5’6 – 5’8”Pant Size 10Pant Size Purchased MUsage Primary Period ProtectionRated 5 out of 5 starsComfy
This is my first time trying period undies. I’ve wanted to try them for a while now, and finally took the plunge during the Knix spring sale. Now, it is an adjustment to get used to (especially if you have some heavier days and the laundry!), but I think another cycle and I’ll become a pro. I’ve bought almost every style and worn each one, but this boybrief style on the light to medium flow days/ nights are sooooo comfy. They don’t ride up in pants and I love that they are cotton. I was a little nervous they’d be lower in the waist than I like, but they’re perfect. I wish Knix would make more of their undies in cotton. One thing I also wish they had was the absorbency icon was labeled on the inside of the underwear somewhere. With so many styles it gets confusing which pair works for which days. All part of the learning curve I suppose. If you’re considering the switch, Knix is great! And they’re Canadian 🇨🇦
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 4.0 on a scale of 1 to 5Poor ExcellentWas this helpful?
