Mix & Match: Buy 4+ Save 15%, Buy 7+ Save 25%
Get into machine-washable boyshort period underwear that absorb the same as about 3.5 super tampons! Switch from relying on disposable products to wearing incredibly comfortable underwear that will protect you every day of your cycle!
Built-in liner is 9” long.
(product previously named Super Leakproof® Boyshort)
🇨🇦 Free standard shipping over $100.
Free expedited shipping over $150.
(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.
I had been in search of a good no-leak panty and Knix is, by far, the best of the best. I say this in terms of the leakage coverage and in terms of fit and style. They are a little pricey, but well worth the cost. I will definitely purchase again
Delivery was quick, and I was happy to see these briefs!
I am so grateful that I found Knix! I am in my 70’s so I wear Knix for incontenance protection.They are so comfortable I could wear them every day. I love all the colors, too!
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.
Ultra
Extra heavy periods, overnight protection & light bladder leaks - absorbs about 13-17 tsp or 65-85 mL which is the equivalent of 7-9 super tampons’ worth.
Heavy
Heavy periods, overnight protection & light bladder leaks - absorbs about 6-11 tsp, 30-55 mL or the equivalent of 3-6 super tampons’ worth.
Medium
Medium periods, light bladder leaks & sweat - absorbs about 3-6 tsp, 15 -30 mL or the equivalent of 2-3 super tampons’ worth.
Light
Light periods, backup protection & sweat - absorbs about 1.5-3 tsp, 7.5-15 mL or the equivalent of 1-3 regular tampons’ worth.
Lightest
Lightest periods, spotting, sweat & discharge - absorbs about 1-1.5 tsp, 4-7.5 mL or the equivalent of 0.5-1 regular tampon worth.
Zero
Everyday wear with no leakproof protection - zero absorbency.
Absorbency | Good for | |
Ultra | Absorbs about 7-9 super tampons’ worth | Extra heavy periods, overnight protection & light bladder leaks |
Heavy | Absorbs about 3-6 super tampons’ worth | Heavy periods, overnight protection & light bladder leaks |
Medium | Absorbs about 2-3 super tampons’ worth | Medium periods, light bladder leaks & sweat |
Light | Absorbs about 1-3 regular tampons’ worth | Light periods, backup protection & sweat |
Lightest | Absorbs about 0.5-1 regular tampon worth | Lightest periods, spotting, sweat & discharge |
Zero | Zero absorbency | Everyday wear with no leakproof protection |
Our Leakproof Period Underwear features multi-layer technology that differs from style to style, but works to ensure you stay fresh, dry and protected. For example, in our Super Leakproof™ No-Show Bikini, the top layer wicks away moisture from your skin; the inner-layer absorbs the liquid and locks it in; and the outer layer keeps any liquid from spotting your clothes.
Depending on the size and style of underwear, the leakproof gusset ranges from around 7.5” to 9” long. Our Super Leakproof(TM) Underwear features a 25% bigger gusset, with more of the coverage in the front of the underwear. For overnight leakproof protection, our Super Leakproof(TM) Dream Short gusset ranges from 10” to 14” long.
