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Color: Warm Sand
New

Color: Warm Sand

Size:

Size:

Mix & Match: 3+ for $25 each
Rewards Members Earn 0 Points
New

Leakproof UltraThin No-Show Boybrief

$34.00 CAD

Mix & Match: 3+ for $25 each
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Absorbs about 2.5 super tampons

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Invisible under clothes

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Moderate protection without the bulk

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Machine washable

| Rose Noir
| Rose Noir
| Rose Noir
| Rose Noir

Color: Rose Noir 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.

Rewards Members Earn 34 Points

Comfort-First Fit

Boybrief silhouette with a classic mid-rise fit and full bum coverage.

Worry-Free Protection

Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.

Moderate Absorbency

Absorbs 2.5 super tampons worth of liquid—perfect for moderate flow days, light bladder leaks, and sweat. The carbon cotton gusset top layer keeps you dry.

No-Show Style

Buttery-soft and smooth fabric gives a seamless look and feel. Disappears under clothes, even leggings.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Rose Noir
| Rose Noir
| Rose Noir
| Rose Noir

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
    6-11 tsp
  • pad
    about 1.5-3 regular pads
  • tampon
    about 3-6 super tampons
  • cup
    about 1-2 menstrual cups

Light

Drop
Drop
Drop
Drop
Drop
  • light period days
  • sweat
  • sweat and 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 3-6 tsp
  • pad
    about 1-1.5 regular pads
  • tampon
    about 2-3 super tampons
  • cup
    about 0.5-1 menstrual cups

Ultra

Drop
Drop
Drop
Drop
Drop
  • extra heavy period days
  • overnight protection
  • light bladder leaks
  • tsp
    13-17 tsp
  • pad
    3.5-4.5 regular pads
  • tampon
    7-9 super tampons
  • cup
    2-3 menstrual cups
FRESH FIX TECHNOLOGY®

Built-in protection that feels like nothing at all.

Our patented 360 LeakSeal™ technology locks in leaks at every edge. The ultra-thin liner absorbs about 2.5 super tampons worth of liquid.

Soft Top Layer

Soft Top Layer

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

4.9
Rated 4.9 out of 5 stars
Based on 17 reviews
Total 5 star reviews: 16 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
17 reviews
  • Rated 5 out of 5 stars
    4 minutes ago
    Great

    Love these as always

    Christina R.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 week ago
    Comfy

    Love them

    Sherry S.
    Verified Buyer
  • Rated 5 out of 5 stars
    4 weeks ago
    Love 💕

    I love these soooooooo much .. it’s like you heard my silent wish for this style.. The dream shorts are awesome if you need all the absorbing power. But these lighter ones fit me so much better. Love love love .. thank you Knox 🙏🏽💕

    Allison G.
    Verified Buyer
  • Rated 5 out of 5 stars
    4 weeks ago
    Best fit yet!

    Feel like normal underwear but with the security no leaks will show. The fit is my new favourite. I’ve had dream shorts, sleep boxers, ultra thin high rise and boy shorts, thigh savers and teen overnight shorts so I’ve tried them all!

    My bladder leak problem has also improved with some help so the boy briefs are perfect. I feel like a woman again in the new boy briefs!!!

    Heather F.
    Verified Buyer
  • Rated 5 out of 5 stars
    4 weeks ago
    No Roll!

    I never liked boyshorts because they always rolled up - these ones do not! Stay in place. Seamless. Extremely comfortable to wear all day long! New favorite, highly recommend!

    Kim N.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    The best!

    Very comfortable, fit well, true to suze

    Adriana L.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Fit is great and no show panty lines.

    I love the cut of these. The fit is perfect and love the no show panty lines.

    DEBBIE S.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Comfortable fit

    Love this fit over the boy shorts. Went up a size so have better abdomen coverage and like the upper leg touch

    Jane A.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Comfy and great price with discount

    I like when you offer discounts for multiples, I wear Knix every day! Comfy and XL fits perfect!

    Jane O.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Size down and more shades for us brown-skinned girlies please :)

    I typically wear a size small and had to exchange for XS-- def size down! I love this style, finally a short that doesnt ride up the bum even the boyshort does, boy-brief is where its at! Would die for it in Sola or Mushroom. Please release more shades soon!

    707kiki707
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Cute and comfortable

    Love these! Thin and no show in jeans.

    Heather T.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Comfy

    I got my normal size medium and they fit fine...they are not tight so I'm unsure if I should have sized down. Plenty of stretch. Overall really comfortable.

    Heather T.
    Verified Buyer