Your Bag

Your cart is empty

But you're full of potential..
Rewards Members Earn 0 Points

Suggestions

Top Picks

The One&Only Scoop Bra®

$29.00 CAD
$65.00
Limited Time Offer

Color: Warm Sand

Leakproof UltraThin No-Show High Rise

$16.00 CAD
$32.00
20-50% off

Color: Rose Noir Limited Edition

Super Leakproof® Dream Team Kit

From 
$80.00 CAD
$96.00
Save $16

Revolution V-Neck Bra

$54.40 CAD
$68.00
20-60% off

Color: Warm Sand

Home / Up to 50% off High Rise Underwear / SuperPlus Leakproof® No-Show High Rise
New

SuperPlus Leakproof® No-Show High Rise

$39.00 CAD

3 for $99
Checkmark

Absorbs 7-11 super tampons

Checkmark

Front-to-back liner

Checkmark

Bonded seams prevent leaks

Checkmark

Machine washable

Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

| Black
Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

Ashley has 39” hips and wears KNIX S | Black

Ashley has 39” hips and wears KNIX S

| General

Ashley has 39” hips and wears KNIX S

Absorbency: Ultra

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

Color: Black

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.
Rewards Members Earn 39 Points

Comfort-First Fit

High-rise silhouette sits at your natural waist and offers medium coverage for the bum, combining comfort with a flattering fit.

Ultimate Leakproof Protection

Our longest, most absorbent liner ever—front-to-back coverage without the bulk.

Day & Night Comfort

Buttery-soft stretch fabric moves with you, while bonded seams keep leaks contained and create a smooth, seamless look under clothing.

Machine Washable

Wash just like your regular underwear—easy, everyday care.

Zoom

Ashley has 39” hips and wears KNIX S | Black
| Black
Ashley has 39” hips and wears KNIX S | Black
Ashley has 39” hips and wears KNIX S | Black
| 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

Our longest, most absorbent liner—ever.

Our original Fresh Fix Technology® features a built-in absorbent liner that soaks up about 7–11 super tampons’ worth of liquid—so you stay fresh, comfortable, and in control.

Soft Top Layer

Soft Top Layer

Gently wicks moisture away 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
30% off Select Colors

Color: Dark Cherry Limited Edition

Ultra Leakproof Zones+® Bikini

$25.00 CAD
$36.00
2 for $40

Color: Black

SuperPlus Leakproof® No-Show High Rise

$39.00 CAD
3 for $99

Color: Black

Leakproof UltraThin No-Show Bikini

$21.60 CAD
$27.00
20-50% off

Color: Warm Sand

Leakproof UltraThin No-Show High Rise

$16.00 CAD
$32.00
20-50% off

Color: Rose Noir Limited Edition

Light Leakproof No-Show Bikini

$20.00 CAD
$25.00
20-60% off

Color: Warm Sand

Super Leakproof® Dream Boxer

$48.00 CAD
*Excluded from Sale

Color: Dark Cherry Stripe Limited Edition

4.4
Rated 4.4 out of 5 stars
Based on 77 reviews
Total 5 star reviews: 58 Total 4 star reviews: 4 Total 3 star reviews: 6 Total 2 star reviews: 2 Total 1 star reviews: 7
81%would recommend this product
ComfortRated 4.3 on a scale of 1 to 5
EffectivenessRated 4.3 on a scale of 1 to 5
FitRated 0.1 on a scale of minus 2 to 2
Ease of UseRated 4.5 on a scale of 1 to 5
Write a Review (Opens in a new window)
77 reviews
  • Rated 5 out of 5 stars
    22 seconds ago
    Perfect Fit!

    I recently decided to try out a bigger size in the leakproof underwear as i felt i wasnt getting enough coverage. These fit soo much better! They are so comfortable and no seams when wearing leggings, etc.

    Desiree K.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Works for heavy days and overnight - no leaks!

    This is a long review, but it touches on absorbency, fit, comfort, and after care.

    I'm always looking for more environmently-friendly, reusable options for my period products, and have been working to get away from pads and tampons; however, I haven't been able to find the right fit...until now. My flow is very heavy day 1 and 2 - I go through several super plus tampons or heavy pads, and leak through the night often. These really do absorb the way they advertise and no leaks. I was also able to wear for several hours before being able to change with no issues at all. They are comfortable to wear and don't feel wet, which was something I worried about before trying.

    For sizing, I feel like they are true to size. I went with the xxl, and usually wear plus size 1X clothes or xxl. This particular style fits slightly more snug at that size than the other, less absorbent, styles, but still very comfortable. The material is soft and stretchy.

    Also on this particular style, the pad area goes from front to back and is thicker than the others. I read reviews that said it felt like a diaper, but I don't feel that way. It's less invasive than a thick pad, and much more comfortable, but it's still something to consider.

    These washed well on a regular cold cycle in my washing machine and were hung to dry. No absorbency or significant fit issues noted after washing.

    JP
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    Yesterday
    Just love these

    Finally!

    Leakproof that REALLY works!!!

    Dorene M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    Best Leak proof panty

    Love the way they fit. No show panty lines or bulk. Comfortable and great protection.

    Mary-Anne C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 days ago
    Good fit

    I like the fabric and the fir

    Trudy C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    6 days ago
    Amazing!

    These helped me so much on my heaviest day. I usually go through about 8 pads in a 12 hour period. Heavy cycle! I was able to wear these for about 7 hours before needing to change out. Highly recommend! Great for sleep too.

    Danette S.
    Verified Buyer
    Was this helpful?
  • Rated 1 out of 5 stars
    6 days ago
    I like knix for incontinence issues... but these are NOT for me.

    These are way too large and bulky. The first batch of Knix underwear I got, I love. But now this latest batch needs to be returned!

    What do I do now'?

    Marilyn O.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Super comfy

    Great fit and great protection! Will be buying more!

    Jess S.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    1 week ago
    Not as advertised

    I was hoping these underwear would get me through my day; unfortunately, I have to change my underwear 2-3 times per day as I was leaking through them. Definitely not "Super plus" absorbency as advertised. Very disappointed.

    Katie
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 week ago
    Comfortable and good leak protection

    Glad I found these leak proof undies. Very comfortable and good leak protection.

    Judy W.
    Verified Buyer
    Was this helpful?
  • Rated 4 out of 5 stars
    1 week ago
    Undetectable

    Great fabric. I haven’t worn them often yet. So far they feel great and no accidents.

    Margaret V.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 weeks ago
    Confortable

    Chaque femme doit en avoir.

    Danielle P.
    Verified Buyer
    Was this helpful?

Save on Underwear Kits

Shop Now Arrow Right

Super Leakproof® Dream Team Kit

From 
$80.00 CAD
$96.00
Save $16

Ultra Leakproof Zones+® Bikini 2-Pack

From 
$40.00 CAD
$72.00
Save $32

Light Leakproof Mystery 2-Pack

From 
$24.00 CAD
$58.00
Save $34

The Full Cycle Kit - Bikini

From 
$127.20 CAD
$159.00
Save $31

Mystery Silhouette 3-Pack

From 
$36.00 CAD
$96.00
Save $60

Ultra Leakproof Zones+® High Rise 2-Pack

From 
$40.00 CAD
$78.00
Save $38

Leakproof UltraThin High Rise 3-Pack

From 
$75.00 CAD
$96.00
Save $21

Light Leakproof High Rise 3-Pack

From 
$60.00 CAD
$87.00
Save $27