Skip to content

Your Bag

Your cart is empty

But you're full of potential..

Create an account to join Club Knix and earn points on this order
Only L, 2XL-4XL Left

Leakproof Cotton Boybrief - Last Call

$25.00 CAD

$35.00

28% off

Absorbs about 3 super tampons

Cotton comfort

More absorbency without bulk

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

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.

Last Call Return Policy

Sale & Last Call

Our Sale Policy

Here's how returns and exchanges work for sale items.

  • Items discounted up to 30% are eligible for a size exchange or store credit
  • Items discounted above 30% are final sale. No refunds, store credits, or exchanges
  • Not sure where your item lands? Chat with us and we'll check for you

Still have questions? View our full policy here.

Rewards Members Earn 25 Points

Comfort-First Fit

A mid-rise boyshort with full bum coverage.

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 with a hint of 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

  • Days you don’t need leak protection. Everyday freshness and moisture wicking.
  • tsp
    0 tsp

Heavy

  • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
  • 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

  • Daily freshness. For sweat, discharge, period spotting, or backup protection.
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

  • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
  • 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

  • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
  • 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
4.2
Rated 4.2 out of 5 stars
Based on 254 reviews
Total 5 star reviews: 166 Total 4 star reviews: 29 Total 3 star reviews: 29 Total 2 star reviews: 9 Total 1 star reviews: 21
Reviews Summary
Customers say these cotton boybriefs are extremely comfortable and soft, with many praising the breathable cotton fabric and secure fit that doesn't ride up or roll down. Users appreciate the leak protection for periods and light incontinence, finding them effective for overnight wear. Many reviews mention the comfortable waistband and leg openings that don't dig in. However, several customers note issues with the absorbent insert not being fully sewn in, causing it to shift or bunch up during wear. Some find the sizing inconsistent, with complaints about items running large or small. A few mention the seams being visible through clothing and concerns about durability, with reports of the insert detaching from the underwear after limited use.
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
Keywords
Keywords
Rating
Ratings
Height
Height
Pant Size
Pant Size
Pant Size Purchased
Pant Size Purchased
254 reviews
  • Rated 5 out of 5 stars
    2 days ago
    Comfortable

    Awesome

    Brittany M.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    1 month ago
    LOVE

    I absolutely love my cotton boy shorts. They are super comfortable. I want one in every color!

    Krissy L.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    1 month ago
    Better than the new version!

    I just received the new version of the cotton boybrief with a thin elastic at the waist and these are way nicer and sit better on my hips. I'm really bummed that you're phasing these out!

    Adrianne
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    2 months ago
    So comfy!

    I tried them for the first time yesterday and loved them! So comfy and did not feel irritated from the material like I would with a pad! I got medium absorbency, I have lighter periods usually with one flowing day and they did well!

    Brittani H.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    2 months ago
    Cotton boybrief

    My skin reacts to fabrics other than cotton so the cotton is important to me

    Shirley C.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    2 months ago
    Love them!

    It feels good to sleep not having to worry about leaking on my period. Definitely will be buying more

    Jamie B.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    2 months ago
    I’ve had the regular briefs for years like them. I figured I’d try the boys briefs love them even better. Wish I could buy more of the boys briefs. They’re just a little too expensive for me right now.

    I’m

    June C.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    3 months ago
    wonderful!

    I am beyond thrilled over these underwear. They are made well and are quite comfortable. I have sensitive skin and these are perfect. There are no rough edges to bother my skin. Im older and have incontinence issues and these are just what i wanted.

    Jennifer H.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    3 months ago
    Best cotton panties I’ve ever had

    I love how these panties feel. They are soft, comfortable, easy to care and washer and dryer. I have several pairs. It was a great purchase.

    Mary E. W.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    3 months ago
    Boybrief

    Excellent fit and very comfortable.

    Chandra C.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    4 months ago
    My favourite underwear

    Comfortable and practical. Excellent product.

    Roz S.
    Verified Buyer
    Reviewing
    Leakproof Cotton Boybrief - Last Call
  • Rated 5 out of 5 stars
    4 months ago
    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
    Reviewing
    Leakproof Cotton Boybrief - Last Call

Your questions, answered.