Take our Underwear quiz
Find your everyday Leakproof Underwear
Take our Bra quiz
Find the support, comfort and fit for you

Sale

New Arrivals
The Polka Dot Edit
15% off CloudCut™
Super Leakproof® Cotton

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
10% off Bra & Underwear Sets*

Color: White with Black Polka Dot Limited Edition

+8

Super Leakproof® Dream Boxer

$48.00 CAD
2 for $80, Save $16

Color: Pink Stripe Limited Edition

Leakproof UltraThin No-Show High Rise

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

Color: Blue Light Limited Edition

+3

Uplift Push Up Bra

$78.00 CAD
10% off Bra & Underwear Sets*

Color: Rose Water

+1
Home / Teen Period Underwear / Teen Super Leakproof® Sleepover Boxer
KnixTeen

Teen Super Leakproof® Sleepover Boxer

$45.00 CAD

New Colors
Checkmark

Absorbs about 7-9 super tampons

Checkmark

Built in leakproof underwear

Checkmark

Optimal overnight protection

Checkmark

Machine washable

| Black
| Black
| Black
| Black
| Black
| Black
| Black
| Black

Absorbency: Heavy

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.
First Pair Risk Free for 30 Days

Leakproof Underwear, Risk Free

Returns & Exchanges

Leakproof Underwear, Risk Free
Trying leakproof underwear for the first time? Your first pair is completely risk free for 30 days. Wear them, wash them, and see how they work for your body. If they’re not right for you, we’ll refund your first pair. Prefer a different size or style? We also offer free exchanges.

How it works:

  • Risk free applies to leakproof underwear on your first order
  • Refund covers the item price (original shipping excluded)
  • Just email info@knix.com and we’ll take care of you

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 45 Points

Product Description

Shop the Knix Teen Super Leakproof® Sleepover Boxer: The ultimate heavy-flow and overnight solution that holds up to 6 tampons. Features an extended absorbent liner and a comfortable, boxer-style fit for total 360-degree protection. Perfect for sleepovers, lounging, and heavy days. Available in inclusive teen sizes and fun colors.

Comfort-First Fit

Combining a loose-fitting boxer with an internal brief for discreet Leakproof protection. Designed to be worn as both loungewear and overnight protection.

Worry-Free Protection

Designed with a built-in leakproof liner that fits snug to the body, it helps lock in leaks from every angle, even as you toss and turn.

Ultra Absorbency

Absorbs 7-9 super tampons' worth of liquid for overnight protection, heavy flow days, and light bladder leaks.

Machine Washable

Machine washable, just like regular underwear.

Zoom

| Black
| Black
| Black
| Black
| Black
| Black
| Black
| Black

How to Choose?

Essential

  • • Days you don’t need leak protection. Everyday freshness and moisture wicking.
  • tsp
    0 tsp

Heavy

  • • Extra peace of mind. For the first days of your cycle, light bladder leaks, or a full night's sleep without a leak.
  • 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

  • • Daily freshness. For sweat, discharge, period spotting, or backup protection.
  • tsp
    about 1-3 tsp
  • pad
    about 1-3 pantyliners
  • tampon
    about 1-3 regular tampons
  • cup
    about 0.5 menstrual cups

Moderate

  • • For mid-cycle flow, surprise cough or sneeze leaks, or a really sweaty spin class.
  • 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

  • • Ultimate peace of mind. For the heaviest period days, light bladder leaks, unexpected postpartum flow, or overnight protection.
  • 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.

So you feel fresh and in-control. Absorbs ~ 7-9 Super tampons.

Soft Top Layer

Soft Top Layer

Gently wicks away moisture while keeping you feeling fresh and odor-free.

Explore Teen Best-Sellers

Teen Super Leakproof® Sleepover Boxer

$45.00 CAD
New Colors

Color: Pink Stripe Limited Edition

+1

Teen Leakproof UltraThin No-Show Bikini 3-Pack

$65.00 CAD
$75.00
Save $10

Color: Pastel Wings/Pink Orchid/Blush Limited Edition

+5

Teen Leakproof UltraThin No-Show Thong

$25.00 CAD
Bundle & Save: 3 for $65

Color: Pastel Wings Limited Edition

+1

Teen Period Swim Sport One-Piece

$99.00 CAD

Color: Aquamarine Limited Edition

+2

Teen Period Swim Bikini Bottom

$55.00 CAD

Color: Lemon Drop Limited Edition

+2

Teen Leakproof UltraThin No-Show Boyshort 3-Pack

$65.00 CAD
$75.00
Save $10

Color: Pastel Wings/Pink Orchid/Blush Limited Edition

+6

Teen First Period Kit - Bikini

From 
$148.50 CAD
$198.00
Save $49
4.5
Rated 4.5 out of 5 stars
Based on 24 reviews
Total 5 star reviews: 16 Total 4 star reviews: 4 Total 3 star reviews: 4 Total 2 star reviews: 0 Total 1 star reviews: 0
83%would recommend this product
ComfortRated 4.5 on a scale of 1 to 5
FitRated 0.2 on a scale of minus 2 to 2
EffectivenessRated 4.3 on a scale of 1 to 5
Ease of UseRated 4.7 on a scale of 1 to 5
Write a Review (Opens in a new window)
24 reviews
  • Rated 5 out of 5 stars
    1 month ago
    Peace of mind

    These were life changing, I slept through the night not dreaming im leaking or leaking and sleeping right through it. I felt comfortable and they worked really well! Highly recommend!

    Ferrell C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 month ago
    Very comfortable.

    I love these boxers. Not only are they super comfortable but the quality of the material is excellent. This is my 3rd pair of boxers.

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

    Absolutely love love these !

    Melissa
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Love these!

    Super comfortable for sleeping and just hanging around. Love them!

    Josette L. N.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Comfort and Confidence

    These boxers are cute and comfortable. They give confidence for overnight sleepovers and lounging around.

    Miranda O.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    👍

    Absolutely love them. Very comfortable. I wish there was a regular non leakproof version as well. I would buy them again.

    Erin W.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Very comfortable

    Bought this for my daughter when on sale. Fits good and it is comfortable. Looks good as well.

    Laura N.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    2 months ago
    Confidence boosters

    These boxers have given my teen a sense of confidence and control with managing her period. I have recommended them to parents more times than I can count!

    Julie B.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    So cute!

    I love these period boxers - I wear them even when I’m not on my period they are so nice. I wish the front gusset was a bit longer, as I flow forward. My mom is jealous of the cool teen colours. Will be buying more.

    Jennifer R.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    Love these Sleepover Boxers!

    I have one in every color!! My absolute favorite sleepwear. You’ll love them!

    Vickie C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    3 months ago
    Love this new innovation!

    I have always heard of knix and period underwear but was always reluctant to try due to the high price and doubt that it would work. I LOVE my new sleeper boxer knix! It helps me be worry free when sleeping on my period. Im always worried about leaking and even sleep on my side during my period to avoid it, which ends in body pain from the uncomfortable sleeping positions. Now, Im able to put on my boxers and sleep without any worry. I do have to say I expected them to fit oversized but they fit pretty snug.

    Olivia L.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    4 months ago
    Love them!

    I wore them for the first time last week and it’s so comfortable. Like wearing board shorts at the beach with underwear included. So comfy almost feel that I could wear them without pants or shorts on top. Like PJ shorts.

    Dashton G.
    Verified Buyer
    Was this helpful?

Shop by Category

Teen Sleepover Boxer

Teen Period Undies

Teen Period Swim

Teen Period Kits

Teen Period Activewear

Teen Leakproof Shortie