Your Bag

Your cart is empty

But you're full of potential..
Rewards Members Earn 0 Points

Suggestions

Top Picks

Revolution V-Neck Bra

$68.00 CAD
10% off Bra & Underwear Sets*

Color: Warm Sand

Super Leakproof® Dream Boxer

$48.00 CAD

Color: Plaid Limited Edition

The Quintessential Sleep Set

$150.00 CAD

Color: Ivory Limited Edition

Leakproof UltraThin No-Show High Rise

$32.00 CAD
Mix & Match: 3+ for $25 each

Color: Black

Home / Boyshort Underwear / Leakproof Cotton Boybrief
Best Seller

Leakproof Cotton Boybrief

$35.00 CAD

Mix & Match: 3+ for $25 each
Checkmark

Absorbs about 3 super tampons

Checkmark

Cotton comfort

Checkmark

More absorbency without bulk

Checkmark

Machine washable

Esther is wearing KNIX M | Black

Esther is wearing KNIX M

| Black
Esther is wearing KNIX M | Black

Esther is wearing KNIX M

Esther is wearing KNIX M | Black

Esther is wearing KNIX M

| General
| General

Esther is wearing KNIX M

Absorbency: Moderate
Drop
Drop
Drop
Drop
Drop

Color: Black

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

Sale & Last Call

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

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.
Rewards Members Earn 35 Points

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

Esther is wearing KNIX M | Black
| Black
Esther is wearing KNIX M | Black
Esther is wearing KNIX M | Black
| 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.

Our Best-Selling Underwear

Shop All Arrow Right

Super Leakproof® Dream Boxer

$48.00 CAD

Color: Plaid Limited Edition

Leakproof UltraThin No-Show High Rise

$32.00 CAD
Mix & Match: 3+ for $25 each

Color: Black

Leakproof UltraThin No-Show Bikini

$27.00 CAD
Mix & Match: 3+ for $25 each

Color: Warm Sand

Leakproof UltraThin No-Show French Cut

$27.00 CAD
Mix & Match: 3+ for $25 each

Color: Black

Super Leakproof® Dream Short

$48.00 CAD

Color: Dark Cherry Limited Edition

Light Leakproof No-Show Bikini

$25.00 CAD
Mix & Match: 3+ for $20 each

Color: Warm Sand

Leakproof UltraThin No-Show High Rise Shimmer 3-Pack

$75.00 CAD
$96.00
Save $21

Color: Tapestry/Burnished Gold/Dark Cherry Limited Edition

Leakproof Cotton High Rise

$29.00 CAD
Mix & Match: 3+ for $25 each

Color: Black

4.2
Rated 4.2 out of 5 stars
Based on 240 reviews
Total 5 star reviews: 155 Total 4 star reviews: 29 Total 3 star reviews: 27 Total 2 star reviews: 9 Total 1 star reviews: 20
77%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)
240 reviews
  • Rated 5 out of 5 stars
    Yesterday
    period leakproof underwear

    These underwear are comfortable to wear and help me during my period since I don't have to always wear bulky pads or tampons.

    Lindsey R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    Cotton Boybrief

    Very comfortable, breathable cotton. The sewn seams are sturdy and not binding. Overall, the best I've tried.

    KATHY H.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    6 days ago
    Good but a little big

    found these to be a little big for me around the waist. Can still use, but I have to roll them down a band! I

    Giavonna D.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    6 days ago
    Ridiculously overpriced

    The underwear us well made, but not what I expected. I must have ordered too quickly, but 25 for one pair of underwear PLUS shipping and tax makes tgese the most expensive underwear I have ever bought or ever will. Knix lost any future orders from me. My Layne Bryant 5 for 35 are a much better price, they fit better, are sexier, and 5 for the price of one has you well beat.

    Julie E.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    6 days ago
    Not the same as they used to be

    I bought the same ones last year and the year before and suddenly these only have a tiny pad like thing sewn in- not absorbent up both sides just a tiny pad that is only sewn on two edges so not only do they not absorb much - it shifts. I wish they would have disclosed that they redesigned. There’s other companies that still do the absorbent fabric up each side.

    Cassandra M.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    6 days ago
    Nice fit, but..

    I wish the legs were longer like the ones I originally ordered. The only reason I ordered the ones I originally ordered were because of the leg length, but I wished the leak protection of the boybrief were in those. Now I'm stuck with boybriefs that don't stay in place because they lack longer length.

    Heather G.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Leakproof Pad Not Sewn In

    Unlike all of the other products I purchased and loved, the leakproof padding was not sewn into the underwear. It is bulky and strange. They were final sale so I couldn’t return them.

    Betsy Z.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    So comfy!

    My favorite go-to for period protection.

    Ariane D.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Perfect

    These are exactly what I was looking for!

    TD
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Leakproof Cotton Briefs

    Fit well. Retains moisture.

    Very sleek. 10/10

    Jean M. W.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Boybriefs

    Havnt worn them yet but they look very comfortable, well made and I know ill feel secure in them

    Lori C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Great Leg Fit

    I love that the legs on the boy briefs never feel tight or dig in.

    Elizabeth K.
    Verified Buyer
    Was this helpful?