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Home / Boyshort Underwear / Leakproof Cotton Boybrief
Best Seller

Leakproof Cotton Boybrief

$35.00 CAD

Mix & Match: 3+ for $25 each
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Absorbs about 3 super tampons

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Cotton comfort

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More absorbency without bulk

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Machine washable

| Mushroom
| Mushroom
| Mushroom
| Mushroom
| General
| Mushroom
| General

Absorbency: Moderate
Drop
Drop
Drop
Drop
Drop

Color: Mushroom Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Leakproof Underwear is Sales Tax Free in Canada*
Free Shipping on orders $100+

Shipping

Shipping
Processing Timelines

Please allow 1-2 business days for our warehouse team to pack and ship your order. During peak periods such as sales, holidays and product launches, please allow up to 4 business days for us to process your order.

Delivery Time

For the most up-to-date delivery time estimates, please refer to the shipping timeline at checkout. Delivery timelines vary depending on location and do not include processing times.

Shipping Charges

Orders over $100* CAD = Free Shipping (2-6 business days)
Orders under $100* CAD = $12 CAD Shipping (1-3 business days)
Orders delivering to NWT, Nunavut and Yukon are subject to $20 delivery fee.
*After discounts, before shipping and taxes.
Easy Exchanges within 30 Days

Returns

Returns

Free Returns

Knix covers the return shipping fees for exchanges and refunds initiated through our Return & Exchange Portal. Exchange orders initiated through our Return & Exchange portal are also eligible for free shipping within the USA and Canada. Please note, the shipping fees on your original order are non-refundable.

Return Policy

Return policy varies by product, please check if your item is refund or exchange eligible by viewing our full policy here.

Sale & Last Call

Items discounted below 30% are eligible for size exchange or store credit. Items discounted 30% and above are final sale – no refunds, store credits, or exchanges can be accommodated.
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Leakproof UltraThin No-Show Boybrief

$34.00 CAD

SuperPlus Leakproof® No-Show Boybrief

$39.00 CAD

Super Leakproof® Dream Short

$48.00 CAD

Comfort-First Fit

A mid-rise boyshort with full coverage in the bum area.

Worry-Free Protection

An innovative floating gusset provides leak protection from every angle.

Moderate Absorbency

Absorbs about 3 super tampons worth of liquid—great for moderate flow days, light bladder leaks, and sweat.

Cozy Cotton-Blend

Soft cotton spandex feels luxurious against your skin.

OEKO-TEX® Certified

Certified according to OEKO-TEX® STANDARD 100, Product Class I : HK020 246396 TESTEX

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Mushroom
| Mushroom
| Mushroom
| Mushroom
| General
| Mushroom
| General

How to Choose?

Essential

Drop
Drop
Drop
Drop
Drop
  • • Everyday Wear
  • • No leakproof protection
  • tsp
    0 tsp

Heavy

Drop
Drop
Drop
Drop
Drop
  • • heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    about 8-14 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 4-7 super tampons
  • cup
    about 1.5-3 menstrual cups

Light

Drop
Drop
Drop
Drop
Drop
  • • light period days
  • • sweat
  • • discharge
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

Drop
Drop
Drop
Drop
Drop
  • • moderate period days
  • • light bladder leaks
  • • sweat
  • tsp
    about 4-8 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-4 super tampons
  • cup
    about 0.5-3 menstrual cups

Ultra

Drop
Drop
Drop
Drop
Drop
  • • extra heavy period days
  • • overnight protection
  • • light bladder leaks
  • tsp
    about 15-20 tsp
  • pad
    about 1.5-2.5 super pads
  • tampon
    about 7-11 super tampons
  • cup
    about 2-3 menstrual cups
FRESH FIX TECHNOLOGY®

Built-in protection that feels like nothing at all.

Absorbs about 2-3 super tampons worth of liquid.

Soft Top Layer

Soft Top Layer

Gently wicks away moisture while keeping you feeling fresh and odor-free.

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4.3
Rated 4.3 out of 5 stars
Based on 207 reviews
Total 5 star reviews: 136 Total 4 star reviews: 27 Total 3 star reviews: 20 Total 2 star reviews: 8 Total 1 star reviews: 16
79%would recommend these products
ComfortRated 4.4 on a scale of 1 to 5
EffectivenessRated 4.3 on a scale of 1 to 5
FitRated 0.1 on a scale of minus 2 to 2
Ease of UseRated 4.5 on a scale of 1 to 5
Write a Review (Opens in a new window)
207 reviews
  • Rated 1 out of 5 stars
    4 hours ago
    1 Star

    Horrible! Ive bought Knix regular panties fir years including the boy shorts. Thought I’d try the cotton ones. The fit was big & the leg openings rolled & stretched. Worse, they were not leakproof. I will never buy these again & tell other women to avoid them as well. A complete waste of money.

    Mary
    Was this helpful?
  • Rated 5 out of 5 stars
    8 hours ago
    5 Stars

    Nice breathable cotton underwear

    GISELLE
    Was this helpful?
  • Rated 5 out of 5 stars
    8 hours ago
    5 Stars

    Nice breathable cotton underwear.

    GISELLE
    Was this helpful?
  • Rated 5 out of 5 stars
    8 hours ago
    5 Stars

    Nice breathable cotton underwear.

    GISELLE
    Was this helpful?
  • Rated 5 out of 5 stars
    23 hours ago
    Comfy and fits well

    These fit me very nice and don’t ride up on me. I wear more for sweat and urine absorption due to urinary incontinence and they works great. I am dry and no more pads! Easy to care for as well.

    Jacquelyn W.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Very comfortable

    Great fit and leak protection. No wedgie or riding up.

    Rebecca A.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 days ago
    5 Stars

    Love these underwear so comfy

    Phyllis
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Moving away from pads

    After a long time wearing pads it's really nice to not be reliant on single use items anymore

    Gabi E.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    2 weeks ago
    Cotton feels good

    The lining on this design is nicer sewn instead of glued I feel like they last longer

    Dara H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Comfortable and Secure

    Love these leakproof cotton underwear. They are comfortable against my sensitive skin. I wear one size larger than I need to prevent skin irritation. They work well, I no longer have to worry about leaks. I appreciate that they are machine wash and dry.

    Barbara E. L.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Leakproof Cotton Boybrief

    Love these! So comfortable.

    Kellie M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Boybriefs

    love them all!

    Rachael M.
    Verified Buyer
    Was this helpful?