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| Warm Sand
Leakproof UltraThin No-Show High Rise
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Color: Warm Sand
New

Color: Warm Sand

Size:

Size:

Mix & Match: 3+ for $25 each
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Home / Bikini Underwear / Ultra Leakproof Zones+® Bikini
Best Seller

Ultra Leakproof Zones+® Bikini

$36.00 CAD

Mix & Match: 3+ for $33 each
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Absorbs about 9 super tampons

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Invisible under clothes

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Extended gusset for extra protection

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Machine washable

| Black
| Black
| Black
| Black
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

Designed with extra long protective coverage in the front & back | General

Designed with extra long protective coverage in the front & back

Washes just like regular underwear | General

Washes just like regular underwear

Absorbency: Ultra

Ultra
Drop
Drop
Drop
Drop
Drop
about 7-9 super tampons
Essential
Drop
Drop
Drop
Drop
Drop
No Absorbency
Light
Drop
Drop
Drop
Drop
Drop
about 1-3 regular tampons
Moderate
Drop
Drop
Drop
Drop
Drop
about 2-3 super tampons
Heavy
Drop
Drop
Drop
Drop
Drop
about 3-6 super tampons

Color: Black

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 36 Points

"When Mother Nature decides to bless you with her presence on leg day, bust out this pair for a workout that’s as comfortable as possible."

- InStyle

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Comfort-First Fit

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

Worry-Free Protection

Our most absorbent underwear features an extra-long liner that runs high in the front and up the back. Patented 360 LeakSeal™ technology provides leakproof protection at every edge.

Ultra Absorbency

Absorbs 9 super tampons worth of liquid—great for heavy flow days, overnight protection, and light bladder leaks.

No-Show Style

Made from our signature buttery-soft PerformaStretch® fabric, it appears invisible under clothing.

Easy to Wash

Machine washable just like regular underwear.

Zoom

| Black
| Black
| Black
| Black
Made with soft, stretchy fabric that’s quick dry for your comfort | General
Designed with extra long protective coverage in the front & back | 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
    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 7-9 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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4.1
Rated 4.1 out of 5 stars
Based on 398 reviews
Total 5 star reviews: 248 Total 4 star reviews: 44 Total 3 star reviews: 39 Total 2 star reviews: 23 Total 1 star reviews: 44
78%would recommend these products
ComfortRated 4.1 on a scale of 1 to 5
EffectivenessRated 4.2 on a scale of 1 to 5
FitRated 0.2 on a scale of minus 2 to 2
Ease of UseRated 4.3 on a scale of 1 to 5
Write a Review (Opens in a new window)
398 reviews
  • Rated 5 out of 5 stars
    3 minutes ago
    Knix products

    Very nice quality and fit. The extra “zones” are great if you are worried about heavy flow while sleeping.

    kim d. d.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Wouldn't be without them

    Absolutely love them, would have more if not so expensive, but I understand and they are worth every penny of it. My sister loves them also. She gets them from me for Christmas every year and her birthday when I can do it, My 44 year old daughter loves them also. Trying to share with as many as I can.

    Eli S.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 days ago
    Absolutely amazing

    These are absolutely amazing underwear and such a life saver. I have a pretty heavy period flow and I can wear these both during the day and while I’m asleep without any pads which is such a relief. Would highly recommend.

    Claire K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 days ago
    Ultra Leakproof Zones+ Bikini

    Excellent for working out- you don’t have to worry about any

    unwanted, embarrassing leakage

    Melisa C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Comfortable, pretty, and holds a lot of liquid!

    I bought the super absorbent underwear. I didn’t measure how much liquid these hold, but I put one pair under the sink, and ran some water into them, then turned them over and there was no leak-thru!’ I’ve worn them and they haven’t let me down so far!

    I got a pair of black, one sort of a tan color and one is a pale pink color. Really happy with these and plan to buy more! Feel so much better with these than a pad that is bulky and shifts position, and they’re almost invisible under even tight pants for me. Will buy again! And customer service has been wonderful!

    Charese P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    HIGH gusset

    I appreciate the high gussett. It goes all the way to the back. I use period panties for extra protection only but it's been hard to find period underwear with gussets that stretch all the way. I just wish the front was extended just slightly more or all the way as well. The underwear is also made of spandex, and I prefer cotton but I haven't found other underwear that beats these.

    carol
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Great fit

    I really love wearing these underwear as the pad is very discreet and the panties feel very comfortable.

    Irene D.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    1 month ago
    Feel like a diaper, absolutely hate them

    After quite a few months I finally decided to leave a review. I originally bought the moderate bikini, until I realized how low the absorbent area is on the back. There was no way these would protect at all when I was asleep. I had to get the ultra to get decent protection, which is the main reason I use period underwear rather than pads. The base underwear material feels so cheap and plasticy, and when I first got them they were super tight, but after a few washes they are now baggy and unless I'm wearing tight pants they feel like a diaper and I feel like people behind me can see them sagging. With tight pants, I also hate the way the slippery material feels against the pant material. Im going to continue to wear these because they do technically work and I spent WAY to much money on them to throw them away, but they make me feel so gross while I'm on my period.

    Kayla
    Verified Reviewer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 month ago
    Works, but there is a limit.

    Bought these because they are have the highest absorbency and I am hoping to use them exclusively, not as a “back up” to other menstrual products.

    And while they work very, very well—even they have a limit to what they can handle. I leaked on my day 2 flow—I had worn them at night and into the day (hectic morning and I didn’t want to change them till after my shower). So while I admittedly pushed them a little hard (no one wants to wear 16 hour old menstrual anything), knowing my flow I’m not sure I actually passed 7-9 super tampons worth of blood in that time.

    Having said that, as I have reflected over my period the last couple days, it’s been better than wearing pads, my only other current alternative.

    I like the cut, the material, and the effectiveness.

    Lydia T.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    great undies

    comfy just a bit smaller than I thought they'd be

    Laura H.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    2 months ago
    Im sorry but feel baggy in the backside and my husband told me he could sme urine

    They feel baggy in the back and odour of urine is noticable

    Vicki P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Works great!

    Bought these for my daughter. She loves them for overnight and heavy days. Very comfortable!

    Stacie N.
    Verified Buyer
    Was this helpful?