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Home / Up to 40% off Boyshort Underwear / Super Leakproof® No-Show Boyshort
New

Super Leakproof® No-Show Boyshort

$32.00 CAD

3 for $75
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Absorbs about 6 super tampons

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Invisible under clothes

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Extended gusset for extra protection

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Machine washable

Megan has 36.5” hips and wears KNIX S | Warm Sand

Megan has 36.5” hips and wears KNIX S

| Warm Sand
Megan has 36.5” hips and wears KNIX S | Warm Sand

Megan has 36.5” hips and wears KNIX S

Megan has 36.5” hips and wears KNIX S | Warm Sand

Megan has 36.5” hips and wears KNIX S

| General

Megan has 36.5” hips and wears KNIX S

Absorbency: Heavy

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

Color: Warm Sand

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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Comfort-First Fit

Boyshort silhouette with a mid-rise fit and extra hip and bum coverage.

Worry-Free Protection

Patented bonded edges help prevent side leaks.

Heavy Absorbency

Absorbs 6 Super tampons worth of liquid—perfect for heavy flow days, overnight protection, and light bladder leaks.

No More Panty Lines

Made from our signature buttery-soft fabric and designed to be invisible under clothes, including leggings.

Easy to Wash

Machine washable just like regular underwear.

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Megan has 36.5” hips and wears KNIX S | Warm Sand
| Warm Sand
Megan has 36.5” hips and wears KNIX S | Warm Sand
Megan has 36.5” hips and wears KNIX S | Warm Sand
| 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 3-6 super tampons 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.

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4.6
Rated 4.6 out of 5 stars
Based on 4,364 reviews
Total 5 star reviews: 3.5k Total 4 star reviews: 523 Total 3 star reviews: 157 Total 2 star reviews: 109 Total 1 star reviews: 117
93%would recommend these products
ComfortRated 4.7 on a scale of 1 to 5
EffectivenessRated 4.6 on a scale of 1 to 5
FitRated 0.0 on a scale of minus 2 to 2
Ease of UseRated 4.6 on a scale of 1 to 5
Write a Review (Opens in a new window)
4,364 reviews
  • Rated 3 out of 5 stars
    4 minutes ago
    Uncomfortable

    I was surprised to find the seams were thick and quite snug. Will have to exchange for an XXL size though I fit an XL in all the other styles.

    Patricia J.
    Verified Buyer
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  • Rated 5 out of 5 stars
    6 days ago
    Love them

    Feel comfortable and protected for night wear

    Robin H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 weeks ago
    Peace of Mind

    Restocked on my Knix undies; even on the heaviest of heavy days I’m still good to go all day at work; love!

    JB
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Very happy

    I love these. I feel more secure when wearing them. I just don’t worry about being out anymore.

    Charlene M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    5 Stars

    Absolutely love these!! no more worries and no more stressing about leaks and staining clothing and bedding.

    Lily
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Leakproof for life!

    I've been using Knix leakproof underwear for about 5 years now. After trying a couple other brands, I found Knix and haven't looked back. They are smooth and invisible under clothing, so comfortable, and even the fabric in the gusset is soft and doesn't chafe (unlike another brand I won't name). I just love these and have gotten my sister's and nieces hooked on them as well.

    Leslie C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Great underwear

    Great for my heavy days. The underwear is so comfortable. I used to have to double up on tampons and wear a pad to not bleed though! Now I’m down to just a single tampon and knix underwear! (Hoping to get rid of the tampon completely!)

    Meagan G.
    Verified Buyer
    Was this helpful?
  • Rated 2 out of 5 stars
    2 months ago
    fussy girl

    i like the newermore coverage boyshort in all honesty.

    Sharie K.
    Verified Buyer
    Was this helpful?
  • Rated 3 out of 5 stars
    2 months ago
    Love the fit - not enough coverage for real leakage protection.

    Like all the knix underwear I have bought, I love the fit and feel, but unfortunately the gusset in the front is not enough. It should go up another 2 inches in my opinion. These would also benefit from another two inches in the back. I don't know who these people are with a "heavy flow" but for me it they just don't prevent leakage the way they are made now. There's no way they absorb 6 super tampons worth. Not because they can't absorb that much, but they just don't absorb fast enough, so there is leakage in the front and in the back on my heavier days. These are fine for the 4th day on for me, but not on days 1-3. I just wish the "super leak proof" options had more coverage, front and back - but not all the way up the back like the "ultra" leakproof. If these problems were addressed I would definitely buy more!

    Dione
    Verified Reviewer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Great Boyshort Brief

    I have purchased several boyshort leakproof briefs from Knix and this one is the best. The fit is perfect and the leakproof feature is better than ever! Thank you.

    Pat M.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Boyshorts

    Not sure about these. They are very comfortable but I thought I was buying for overnight protection and they did not do the job properly. So have not worn them for a full day.

    I like them and they are comfortable so may add to my stockpile buy for day wear only.

    Maureen P.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    More front coverage! YES!!!

    These Super Leakproof Boyshort 2.0 underwear have made me return to Knix. The extended gusset creates significantly more front coverage!

    TL
    Verified Buyer
    Was this helpful?