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
Buy a Bra, Get Free Ultrathin Undies | Code: FREELEAKPROOF

Color: White with Black Polka Dot Limited Edition

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 with White Polka Dot Limited Edition

Home / Bikini Underwear / Leakproof UltraThin No-Show Bikini
Limited Time Offer

Leakproof UltraThin No-Show Bikini

$27.00 CAD

Buy a Bra, Get Free Ultrathin Undies | Code: FREELEAKPROOF
Checkmark

Absorbs about 2.5 super tampons

Checkmark

Invisible under clothes

Checkmark

Moderate protection without the bulk

Checkmark

Machine washable

| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| General
| General
| General

Absorbency: Moderate

Moderate
Drop
Drop
Drop
Drop
Drop
about 2-4 super tampons
Essential
Drop
Drop
Drop
Drop
Drop
No Absorbency
Light
Drop
Drop
Drop
Drop
Drop
about 1-3 regular tampons
Heavy
Drop
Drop
Drop
Drop
Drop
about 4-7 super tampons
Ultra
Drop
Drop
Drop
Drop
Drop
about 7-11 super tampons

Color: Black with White Polka Dot Limited Edition

Size:

True to Size

•

Size:

Size and Fit Guide

Leakproof Underwear is Sales Tax Free in Canada*
Free Express Shipping on orders $125+

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 27 Points

Get a free pair of Ultrathin undies when you buy an eligible bra.
Use Code FREELEAKPROOF

Shop Now

Comfort-First Fit

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

Worry-Free Protection

Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.

Moderate Absorbency

Absorbs 2.5 super tampons worth of liquid—perfect for moderate flow days, light bladder leaks, and sweat. The carbon cotton gusset top layer keeps you dry.

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.

Zoom

| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| Black with White Polka Dot
| General
| 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.

Our patented 360 LeakSeal™ technology locks in leaks at every edge. The ultra-thin liner absorbs about 2.5 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 Team Kit

From 
$80.00 CAD
$96.00
Save $16

Super Leakproof® Dream Short

$48.00 CAD

Color: Black with White Polka Dot Limited Edition

SuperPlus Leakproof® No-Show High Rise

$39.00 CAD
Mix & Match: 3+ for $33 each

Color: Black

Leakproof UltraThin No-Show Bikini

$27.00 CAD
Buy a Bra, Get Free Ultrathin Undies | Code: FREELEAKPROOF

Color: Black with White Polka Dot Limited Edition

Leakproof UltraThin No-Show High Rise

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

Color: Black with White Polka Dot Limited Edition

Light Leakproof No-Show Bikini

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

Color: Warm Sand

Super Leakproof® Dream Boxer

$48.00 CAD

Color: Plaid Limited Edition

Leakproof UltraThin No-Show French Cut

$27.00 CAD
Buy a Bra, Get Free Ultrathin Undies | Code: FREELEAKPROOF

Color: Black with White Polka Dot Limited Edition

4.4
Rated 4.4 out of 5 stars
Based on 627 reviews
Total 5 star reviews: 464 Total 4 star reviews: 64 Total 3 star reviews: 38 Total 2 star reviews: 27 Total 1 star reviews: 34
87%would recommend these products
ComfortRated 4.6 on a scale of 1 to 5
EffectivenessRated 4.6 on a scale of 1 to 5
FitRated -0.2 on a scale of minus 2 to 2
Ease of UseRated 4.7 on a scale of 1 to 5
Write a Review (Opens in a new window)
627 reviews
  • Rated 3 out of 5 stars
    3 minutes ago
    Feels Small

    I am not happy with the fit of this style. They felt tight around my legs and smaller than other styles I have purchased. I would advise sizing up.

    Judith H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    12 hours ago
    Loooove!

    I absolutely love everything about them !

    Cora Y.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    19 hours ago
    no-show

    These are very comfortable and feel great. Will be a return customer

    thank goodness I found great undies

    judy h. g.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    More Confortable than depends

    First time with this product. My daughter and granddaughter reccomended them. More comfortable than depends for urinary issues

    BARBARA V. L.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 days ago
    3 Stars

    The color is accurate, and the absorption is good. I wish it felt less bulky, I expected it to be less like wearing a pad but unfortunately it is quite similar. It rides up in the back and get all scrunchy when you walk or move around. I should have gotten a size larger, but that is not the companies fault.

    Roberta
    Was this helpful?
  • Rated 2 out of 5 stars
    5 days ago
    2 Stars

    I’ve order the same size in the past so I didn’t think twice…. But these are very tight I had to double check I ordered the right size. Disappointed:(

    Jennifer
    Was this helpful?
  • Rated 2 out of 5 stars
    5 days ago
    The new large

    For years I have slowly been replacing all my panties with knix panties; and this year the transition was completed when I bought this set. I wear a size L, so that's the size I ordered. Sadly, the L is now made smaller in this style and they are too tight. I compared them to size L bikinis I bought last year to confirm the size difference (see photos). I am very disappointed.

    Clennita J.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    Love these so much

    No other brand for me, great quality, nice colour selections, good sales and loyalty program.

    Sandy J.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Ultra Thin is accurate

    These briefs are truly ultra thin. I prefer the cotton ones so I know I have something on. If you prefer the commando feeling, try this design.

    Toni F.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    1 week ago
    3 Stars

    La taille est plus petite à comparer avec les autres modèles que j’ai acheté.

    Anais
    Was this helpful?
  • Rated 1 out of 5 stars
    1 week ago
    Bikini cut

    Very small! Not at all true to size

    Cynthia H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    5 Stars

    I have been buying and wearing these undies since they first came out. Im an old bat now so i use them for sneeze,laugh,cough bladder issues. There was a short time when the quality went down a bit on finishing but it was corrected. Well worth the price because they last and dont ride

    Casandra
    Was this helpful?