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Color: Black
Best Seller

Color: Black

Size:

Size:

Size and Fit Guide

Mix & Match: 3+ for $20 each
Rewards Members Earn 0 Points
Kristen's Fave

Light Leakproof No-Show French Cut

$25.00 CAD

Mix & Match: 3+ for $20 each
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Absorbs about 1 regular tampon

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Invisible under clothes

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Perfect for daily wear

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Machine washable

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| General

Color: White

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 25 Points

Comfort-First Fit

A French-cut silhouette that sits at the natural waistline and provides medium bum coverage.

Worry-Free Protection

Our original leakproof technology provides a barely noticeable feel. Patented bonded edges help prevent side leaks.

Light Absorbency

Absorbs 1 regular tampon worth of liquid—perfect for light flow days, sweat and discharge, and backup protection for heavy flow days.

No-Show Style

Made from our signature buttery soft fabric with a wide, comfortable waistband. Wear it on its own or under your favorite pajamas.

Easy to Wash

Machine washable just like regular underwear.

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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
PATENTED LEAKPROOF TECHNOLOGY

Built-in protection that feels like nothing at all

Our original Fresh Fix Technology® features a built-in absorbent liner absorbing about 1 regular tampon worth of liquid so you feel fresh and in-control.

Soft Top Layer

Soft Top Layer

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

4.6
Rated 4.6 out of 5 stars
Based on 1,402 reviews
Total 5 star reviews: 1.1k Total 4 star reviews: 137 Total 3 star reviews: 58 Total 2 star reviews: 40 Total 1 star reviews: 35
92%would recommend these products
ComfortRated 4.7 on a scale of 1 to 5
EffectivenessRated 4.7 on a scale of 1 to 5
FitRated 0.1 on a scale of minus 2 to 2
Ease of UseRated 4.7 on a scale of 1 to 5
1,402 reviews
  • Rated 5 out of 5 stars
    2 weeks ago
    Perfect fit and comfy. And no panty lines!

    I only wear Knix underwear. So many styles and colours to choose from. Great fit and fabric.

    They last a long time so are worth every penny.

    Christine M.
    Verified Buyer
  • Rated 2 out of 5 stars
    3 weeks ago
    Leaks

    I love Knix. Half of my wardrobe comes from here: bras, sports bras, leggings, underwear, swimwear, loungewear, sleepwear, shapewear, thigh savers... You name it, I own it. This is why I am so heartbroken about the so-called leakproof underwear. I own over 10 pairs, different ones. They have different degrees of absorbency, most of them are deemed heavy. All of them leak. Every. Single. Time. I have resorted to buy another brand.

    I just ordered a mystery leakproof pack because it was on sale, but I use them for everyday wear. They are perfect for that, but I don't trust them anymore on my period. Even on light days, they can't handle it.

    Will still buy Knix, just not Leakproof.

    Aimée V.
    Verified Buyer
  • Rated 5 out of 5 stars
    4 weeks ago
    Love them

    Love the fabric, feel like you wearing nothing except for the back padding liner shows through when you wear tight leggings or paints. Otherwise I bought a load for travel, makes me feel more confident to have a nice trip without bringing change of pants 😜

    Annick G.
    Verified Buyer
  • Rated 3 out of 5 stars
    1 month ago
    Underwear

    I’m used to underwear with silicone on the legs and they stay in place. I found your underwear doesn’t stay in place the same

    Cindy L.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Perfect

    Love those panties- no need to wear pads anymore

    Guylaine P.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    French cut

    Comfortable

    Nancy B.
    Verified Buyer
  • Rated 3 out of 5 stars
    1 month ago
    Nice but just not my favourite of the ones I bought.

    Personally just not my favourite fabric. Could be someone else's favourite, however.

    Karin S.
    Verified Buyer
  • Rated 4 out of 5 stars
    1 month ago
    Bunching

    Great fit and size however the underwear bunches in the back causing an embarrassing look. (like wearing a diaper) overall these underwear are great other than the bunching

    Gabriella
  • Rated 5 out of 5 stars
    1 month ago
    leakproof

    these are so comfortable love them

    Shelly N.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Won’t wear anything else!

    Love Knix, it’s the only thing I wear!! Only 2 small complaints would be I wish they were just a little bit more affordable and that the leak coverage came up just ever so slightly more in the front.

    Lisa B.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Love these!

    I’ve been looking for a long time and finally found the perfect underwear! They stay put, don’t roll down, they don’t show, they fit perfectly, and bonus, they catch and somehow deodorize any leaks!

    Robyn D.
    Verified Buyer
  • Rated 5 out of 5 stars
    1 month ago
    Good product

    Fit good, smooth under clothes and no panty lines. Happy with this brand so far

    Tracy A.
    Verified Buyer