Your Bag

Your cart is empty

But you're full of potential..

You Might Also Like

| Black
Light Leakproof No-Show Bikini
$25.00 CAD

Color: Black
Best Seller

Color: Black

Size:

Size:

Size and Fit Guide

Mix & Match: 3+ for $20 each
Rewards Members Earn 0 Points

Suggestions

Top Picks

Revolution Scoop Bra

$68.00 CAD
10% off Bra & Underwear Sets*

Color: Cheetah Print Limited Edition

Catalyst Sports Bra

$72.25 CAD
$85.00
15-30% off

Color: Black

Leakproof UltraThin No-Show High Rise

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

Color: Cosmic Limited Edition

Super Leakproof® Dream Short

$48.00 CAD
Mix & Match: 3+ for $33 each

Color: Black

Home / All Underwear / Leakproof Cotton Bikini
Best Seller

Leakproof Cotton Bikini

$25.00 CAD

Checkmark

Absorbs about 3 super tampons

Checkmark

Breathable cotton comfort

Checkmark

More absorbent without the bulk

Checkmark

Machine washable

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

You May Also Like

Leakproof UltraThin No-Show Bikini

$27.00 CAD

Light Leakproof No-Show Bikini

$25.00 CAD

Good to Go Seamless Bra

$48.00 CAD

Comfort-First Fit

Bikini silhouette with a classic mid-rise fit and medium hip and 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 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

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.

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.

Explore Best-Sellers

Catalyst Sports Bra

$72.25 CAD
$85.00
15-30% off

Color: Black

Revolution V-Neck Bra

$68.00 CAD
10% off Bra & Underwear Sets*

Color: Black

Super Leakproof® Dream Short

$48.00 CAD
Mix & Match: 3+ for $33 each

Color: Black

WingWoman Contour Bra

$75.00 CAD
10% off Bra & Underwear Sets*

Color: Warm Sand

The One&Only Scoop Bra®

$65.00 CAD
10% off Bra & Underwear Sets*

Color: Warm Sand

Light Leakproof No-Show High Rise

$29.00 CAD
Mix & Match: 3+ for $20 each

Color: Warm Sand

Light Leakproof No-Show Bikini

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

Color: Warm Sand

Essential No-Show Bikini

$22.00 CAD
Mix & Match: 3+ for $20 each

Color: Warm Sand

4.5
Rated 4.5 out of 5 stars
Based on 188 reviews
Total 5 star reviews: 142 Total 4 star reviews: 18 Total 3 star reviews: 11 Total 2 star reviews: 8 Total 1 star reviews: 9
86%would recommend these products
ComfortRated 4.7 on a scale of 1 to 5
EffectivenessRated 4.5 on a scale of 1 to 5
FitRated 0.1 on a scale of minus 2 to 2
Ease of UseRated 4.8 on a scale of 1 to 5
Write a Review (Opens in a new window)
188 reviews
  • Rated 5 out of 5 stars
    2 weeks ago
    Soft, comfortable and virtually invisible

    I’m never going to need pantyliners or back-up pads again. These underwear are so soft and fit as though there were no liner at all.

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

    Love the coverage and the comfort!

    Sharlene G.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Knix bikini

    I love these all cotton leakproof underwear. They are just as described. They are not bulky and I feel more confident wearing them because they will catch potential leaks.

    Rosa R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 weeks ago
    Got these to try out

    These were comfortable to try for the first time. They feel like I have only underwear on. Feels lightweight at night when I am sleeping. 100% would buy these again.

    Ashley B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 weeks ago
    Great!

    Very comfortable and brings me a sense of confidence. I'm a size 2X and I bought a XXXL size underwear.

    Lisa R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    So comfortable and feels like im wearing regular underwear. Made it easy to make it through my busy work day without worrying about anything.

    Jayden
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Love this product!

    Don't have to worry about constantly changing tampons. Highly recommend.

    Stephanie R.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    1 month ago
    2 Stars

    Just runs big. I wear medium alot but ordered smalls for this underwear I needed at least an xs or xxs to make it fit

    C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Recommend

    I bought these for my two daughters and myself. I only wish something like this existed years ago when I started having my period!! I use them for light bladder leaks - while my daughters use them for their periods - they also help absorb sweat - they have many uses! These panties are so comfortable, they feel just like a regular panty - but you have the added protection! We have all the colors - they are very soft. They wash well and will last for years to come. They fit true to size. It's up to you if you still want to wear a liner just in case - but we haven't had the need as they absorb very well. I'm very happy with my purchase. I highly recommend! Thank you :)

    Yvonne B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    Fits nicely

    Nancy
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Even better than the original leak proof!!

    I bought these to try a different material and I absolutely love them!! The cotton is unbelievably comfortable and the gusset feels soft and not as wet as the polyester types, if that makes sense. The only thing I would note is that the liner isn't seamless and has one seam at the back that doesn't lie flat (isn't sewn down). It isn't uncomfortable at all though!

    Kaitlyn C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Awesome panties

    They are the best panties evet!

    Teresa S.
    Verified Buyer
    Was this helpful?