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Home / Bikini Underwear / Leakproof UltraThin No-Show Bikini
Sale

Leakproof UltraThin No-Show Bikini

$21.60 CAD

$27.00

20-40% off
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Absorbs about 2.5 super tampons

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Invisible under clothes

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Moderate protection without the bulk

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Machine washable

| Rose Water
| Rose Water
| Rose Water
| Rose Water
| 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: Rose Water

Size:

True to Size

•

Size:

Size and Fit Guide

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

Shipping

HOLIDAY SHIPPING

Give the gift of Knix! To receive your order by Dec 24th, please order by the following dates.

Toronto, Ottawa, Montreal, Winnipeg, Regina, Calgary, Edmonton, Vancouver
Standard & Expedited: Monday, December 22

Urban Centres (excluding the above)
Standard: Wednesday, December 17
Express: Sunday, December 21

Rest of Canada
Standard: Sun, December 14*
Express: Thu, December 18*
*YK, NWT, NT, NL, and remote areas across Canada.

For locations serviced solely by Canada Post, please allow at least 5 additional days due to rotating strikes. This applies to P.O Box and RR addresses.

To avoid any additional delays during the rotating strikes, we will use alternate carriers when possible.

Please note: Weather conditions and carrier issues may cause delays. Delivery dates are not guaranteed.

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.
Year End Sale Return Policy

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.
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"These are my favorite of all the period underwear styles I have tried, and I now own enough for a full cycle of wear."

- InStyle

Comfort-First Fit

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

Worry-Free Protection

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

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

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4.5
Rated 4.5 out of 5 stars
Based on 591 reviews
Total 5 star reviews: 445 Total 4 star reviews: 61 Total 3 star reviews: 34 Total 2 star reviews: 25 Total 1 star reviews: 26
88%would recommend these products
ComfortRated 4.5 on a scale of 1 to 5
EffectivenessRated 4.5 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)
591 reviews
  • Rated 1 out of 5 stars
    4 minutes ago
    Very UN-comfy!

    I wanted to love these so much but the fabric is awful.. they are stiffer and scratchier somehow, with alot less flexibility and stretch in the fabric! And they are also made very small! My usual size was way too tight.

    Chelsey S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    20 hours ago
    Love these!

    This was a repeat order for me. I love these ultra thin undies. The leakproof moderate absorbency have better coverage in the front against leaks compared to the light absorbency.

    Rachel C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    23 hours ago
    New type but really nice!

    At first, I wasn’t impressed because these seemed very different from my previous undies……..but as I have NOW adjusted to a different style, I’m liking them more and more! They are comfortable and cute. They fit well, wash well and make me feel secure and happy to wear them! Thank you KNIX!!

    Barbara K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    23 hours ago
    Best Panties EVER!

    I love Knix. I love every product I’ve bought from them. It’s the best ever!

    Cynthia B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Love them!

    They are so comfortable. Great fit! And the leakproof works perfectly. I’ve switched entirely to this set!

    Sarah M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    The only underwear!

    No show comfortable and leak protection all in one

    BARBARA R.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    Yesterday
    3 Stars

    Still waiting to see how these go, the fit is good though.

    Jessica
    Was this helpful?
  • Rated 2 out of 5 stars
    Yesterday
    Quality isn’t as it should be and they run super small

    I have loved Knix over the last few years. I decided to take advantage of their recent sale and was disappointed in many of the undies I received. They are size Medium and all are bikini but they vary in size and some of the material feels cheap and different than normal.

    Susan P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Comfy, sleek and secure

    Love them!

    Sarah I.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    Yesterday
    2 Stars

    J’ai l’impression qu’elles sont une taille trop petite. J’avais déjà commander la même taille auparavant. Il y a quasiment 2 cm de différence entre celle que j’avais déjà et celles-ci

    LAURIE
    Was this helpful?
  • Rated 2 out of 5 stars
    3 days ago
    Not what they used to be

    I have been wearing Knix since, I think, almost the start of the company. I'm still wearing some of the first ones I bought. As I reached the age of leaks, Knix started offering the leak proof panties. I noticed they don't hold up as well as the originals. This latest set has a whole new wrinkle -- sizing. I've worn the same size for years as my weight went up and down. I bought the same size in this set, but they seem to be at least two sizes smaller. Must be a very recent change as my dream boxers fit fine. Wish they'd warned me. Looking at the new size chart, the pant size is the same, but the hip measurement is drastically different.

    Deborah S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    Comfy

    I've been using Knix underwear for a few years now. They're very comfortable and are now my everyday underwear. I like that they are no-show.

    Julie G. K.
    Verified Buyer
    Was this helpful?