Your Bag

Your cart is empty

But you're full of potential..

You Might Also Like

| Warm Sand
Leakproof UltraThin No-Show High Rise
$32.00 CAD

Color: Warm Sand
New

Color: Warm Sand

Size:

Size:

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

Suggestions

Top Picks

Classic Cotton PJ Set

$120.00 CAD

Color: Blue Stripe Limited Edition

Revolution Scoop Bra

$68.00 CAD
10% off Bra & Underwear Sets*

Color: Cheetah Print Limited Edition

SculptRib™ Cotton Henley Dress

$98.00 CAD

Color: Olive Limited Edition

Super Leakproof® Dream Short

$48.00 CAD

Color: Rose Noir Limited Edition

Home / Bikini Underwear / Light Leakproof Bikini
New

Light Leakproof Bikini

$25.00 CAD

Mix & Match: 3+ for $20 each
Checkmark

Absorbs about 1 regular tampon

Checkmark

Invisible under clothes

Checkmark

Perfect for daily wear

Checkmark

Machine washable

| Rose Water
Claire has 35

Claire has 35" hips, 24" waist and wears a Knix size S

Claire has 35

Claire has 35" hips, 24" waist and wears a Knix size S

Claire has 35

Claire has 35" hips, 24" waist and wears a Knix size S

Made with soft, stretchy fabric that’s quick dry for your comfort | General

Made with soft, stretchy fabric that’s quick dry for your comfort

Wear on their own or as backup protection | General

Wear on their own or as backup protection

Washes just like regular underwear | General

Washes just like regular underwear

Absorbency: Light

Light
Drop
Drop
Drop
Drop
Drop
about 1-3 regular tampons
Essential
Drop
Drop
Drop
Drop
Drop
No Absorbency
Moderate
Drop
Drop
Drop
Drop
Drop
about 2-4 super tampons
Heavy
Drop
Drop
Drop
Drop
Drop
about 4-7 super tampons

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

"...the most comfortable period underwear I've ever tried."

- Good Housekeeping

You May Also Like

Leakproof UltraThin No-Show Bikini

$27.00 CAD

Revolution V-Neck Bra

$68.00 CAD

Super Leakproof® Dream Short

$48.00 CAD

Comfort-First Fit

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

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 Water
Claire has 35
Claire has 35
Claire has 35
Made with soft, stretchy fabric that’s quick dry for your comfort | General
Wear on their own or as backup protection | General
Washes just like regular underwear | 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
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.

Explore Best-Sellers

The One&Only Scoop Bra®

$65.00 CAD
10% off Bra & Underwear Sets*

Color: Warm Sand

Revolution V-Neck Bra

$68.00 CAD
10% off Bra & Underwear Sets*

Color: Wintergreen Limited Edition

Super Leakproof® Dream Short

$48.00 CAD

Color: Dark Cherry Limited Edition

Light Leakproof No-Show High Rise

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

Color: Warm Sand

WingWoman Contour Bra

$75.00 CAD
10% off Bra & Underwear Sets*

Color: Black

Good to Go Seamless Bra

$48.00 CAD
10% off Bra & Underwear Sets*

Color: Warm Sand

Leakproof UltraThin No-Show Bikini

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

Color: Black

Leakproof UltraThin No-Show High Rise

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

Color: Rose Noir Limited Edition

4.0
Rated 4.0 out of 5 stars
Based on 6 reviews
Total 5 star reviews: 4 Total 4 star reviews: 0 Total 3 star reviews: 1 Total 2 star reviews: 0 Total 1 star reviews: 1
83%would recommend this product
Write a Review (Opens in a new window)
6 reviews
  • Rated 5 out of 5 stars
    2 weeks ago
    Comfortable

    Very comfortable for everyday wear

    Sarah M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Comfort meets function

    These are so comfortable and provide panty-liner security. Love them!

    Sharlene T.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    5 months ago
    Love the Vision, But Sizing Needs Work for Curvier Girls

    As a catastrophe adjuster who moves a LOT and as a curvier, bottom-heavy girl, I was excited to try Knix’s leakproof underwear for comfort, protection, and peace of mind during long work days. I ordered both the Leakproof No-Show Bikini (L) and the Leakproof Dream Shorts, and here’s the real tea:

    No-Show Bikini (L):

    I sized up from my usual Medium to a Large, hoping for that just right fit—not too tight where leaks could escape, but not too loose either. The fit was okay at first and it did stretch a bit with movement. But here’s the issue: the bikini cut didn’t work well for my fuller bum and thighs. It gave that “double-cheek” effect with spillage not a dealbreaker, but definitely not ideal for someone active and curvy. I’ve since exchanged for an XL and am hoping it won’t loosen up too much with wear.

    Final Thoughts:

    I love what Knix is doing and see the huge potential, especially for active women. Just be mindful that the sizing is inconsistent between styles—especially if you’re curvy or in a physically demanding job. Still a fan, just waiting for that perfect fit!

    Keiarra H.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    11 months ago
    Definitely not no-show and gusset too small

    I bought 3 pairs of light underwear and they kept sending me medium absorbency. Also, the gusset is very short and doesn’t provide protection in the front. Lastly, they are definitely not no-show. You can totally see the lines under tight pants.

    Dayna
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 years ago
    Thanks so much

    I have just tried these out and am so grateful to have them and to not need to create more waste using tampons and liners.

    Beth
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 years ago
    Super comfortable

    This underwear is a game-changer for periods. It’s super comfortable, it doesn’t move throughout the day, and I haven’t had any spillage. I’ve had mine for over a year now and the fabric still looks good after so many washes. They’re true to the size chart on Knix’s website. I highly recommend!

    Lauren
    Verified Buyer
    Was this helpful?