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Home / Black Friday Sale / Leakproof Cotton Boybrief
Hot Deal 🔥

Leakproof Cotton Boybrief

$24.50 CAD

$35.00

3 for $39
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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

| Rose Water
| Rose Water
| Rose Water
| Rose Water
| General
| General

Absorbency: Moderate
Drop
Drop
Drop
Drop
Drop

Color: Rose Water

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.
Black Friday Return Policy

Returns

Returns
Black Friday Sale & Last Call

Items discounted at 30% or below are eligible for a size exchange or store credit. Refunds are not available for these items. Items discounted above 30% are considered final sale and are not eligible for refunds, store credits, or exchanges. Items marked “Clearance” are also final sale and cannot be returned, exchanged, or refunded. No exceptions.
Rewards Members Earn 24 Points

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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.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Rose Water
| Rose Water
| Rose Water
| Rose Water
| General
| 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.

Black Friday Deals

Shop All Arrow Right

Good to Go Seamless Bra

$29.00 CAD
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Exclusive Offer

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Exclusive Offer

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Super Leakproof® Dream Short 2-Pack

From 
$65.00 CAD
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Save $31

Original WingWoman Contour Bra

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$75.00
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Leakproof Ultrathin French Cut Mystery 3-Pack

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Revolution V-Neck Bra

$47.60 CAD
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Essential Rainbow High Rise 3-Pack

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SculptRib™ Cotton Long Sleeve Top

$49.60 CAD
$62.00
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4.2
Rated 4.2 out of 5 stars
Based on 197 reviews
Total 5 star reviews: 128 Total 4 star reviews: 26 Total 3 star reviews: 20 Total 2 star reviews: 8 Total 1 star reviews: 15
79%would recommend these products
ComfortRated 4.3 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)
197 reviews
  • Rated 5 out of 5 stars
    3 minutes ago
    Leakproof Cotton Boybrief

    Love these! So comfortable.

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

    love them all!

    Rachael M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    5 days ago
    Parfait

    J’en ai 2 paires et ils sont très bien. Je suis 5’3 et 160lbs et j’achète un L dans ce modèle. Parfait pour dormir.

    Annie
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    fav

    stays up is really comfortable soft and it is very absorbent. It’s perfect.

    Lisa M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Omg! I love these!

    They are so soft and stretchy, supremely comfortable with great coverage all the way up the back. Perfect for overnight.

    Jocelyn B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    So comfy

    Knox items are comfortable and helps keep you confident.

    D P.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    Amazing

    Love these! They are comfortable and do the job.

    Katherine S.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    1 month ago
    Not as much coverage as the old school boxers from knix, but it’s all right

    I like it when they’re underwear was thicker and more absorbent because I sweat. But they’re still cute and comfy.

    Rhonda H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Honestly life changing

    These are honestly life changing. I wear them to absorb sweat during my workouts in addition to wearing them during my cycle. I’m very happy I found these.

    Marci S.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    1 month ago
    3 Stars

    Fabric is very soft and comfortable. However, the waistband tends to roll and bunchup on me:(

    Not sure if this due to my protruding belly; perhaps a hipster version of this will alleviate the rolling and bunching.

    Lavina
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Awesome underwear

    I love wearing these during my period and when I workout. They are very absorbent and wash and wear well. My husband even likes the way they look.

    Marci S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Comfy & Supportive

    These are 10/10! Gentle around all the edges and thin enough to wear with pants, even leggings

    Jackie
    Was this helpful?