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Underwear By Absorbency
Light
Drop
Drop
Drop
Drop
Drop

Absorbs 1-3 regular tampons
Moderate
Drop
Drop
Drop
Drop
Drop

Absorbs 2-4 super tampons
Heavy
Drop
Drop
Drop
Drop
Drop

Absorbs 4-7 super tampons
Leakproof Explained
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Sleepover Short
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Home / Moderate Absorbency / Leakproof UltraThin No-Show Underwear Bikini 3-Pack
Bundle Deal

Leakproof UltraThin No-Show Underwear Bikini 3-Pack

$75.00 CAD

15% OFF applied at checkout
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Absorbs about 2.5 super tampons

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Invisible under clothes

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Superior protection without the bulk

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Machine washable

| Red Tulip/Scarlet/Super Pink
| Red Tulip/Scarlet/Super Pink
| Red Tulip/Scarlet/Super Pink
| Red Tulip/Scarlet/Super Pink

Absorbency: Moderate

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: Red Tulip/Scarlet/Super Pink Limited Edition

Size:

True to Size

•

Size and Fit Guide

Leakproof Underwear is Sales Tax Free in Canada*
FREE Shipping on orders $80+

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. Once an order is placed, we cannot guarantee any address updates, order changes or cancellations. Orders placed on Friday after 1PM will not be shipped until the following Monday.

Most orders will ship from a single warehouse. However, we occasionally ship from a combination of warehouse locations, so you may receive your order in multiple parts. If items from your order ship in separate packages, we’ll send you tracking information for each package when it becomes available.

Delivery Timelines

For the most up to date delivery time estimates, please refer to the shipping timeline at checkout. All transit times are measured in business days which are Monday-Friday, excluding holidays.

Please note, all shipping timelines are estimates and are not guaranteed.

Canadian Orders

Orders within Canada will be shipped with Canada Post or Purolator based on your address and carrier availability.

Standard Canadian shipping is free on eligible orders over $80 CAD*. Orders under $80 CAD are $12 CAD for standard shipping. Orders delivering to NWT, Nunavut, and Yukon under $100 CAD* are $20 CAD for standard Canada shipping.

*After discounts, before shipping and taxes
First Pair Risk-Free Policy

First Pair Risk Free for 30 Days

First Pair Risk-Free Policy

Because they’re, well, underwear, we can’t accept exchanges or returns on used items. BUT you can try your first pair on your first order risk-free for 30 days!

If you ordered the wrong size of period underwear, we’ll send you a different pair at no cost or offer you a standard refund* within 30 days of delivery (excluding original shipping fees).

If your order included multiple period underwear, open, wash, and wear one pair only. That way if you don’t love them, any unopened packages from the same purchase will be eligible for an exchange or a standard refund* (excluding original shipping fees).

All unopened packages will be donated to local organizations to support people in need.
“My daughter has been exclusively wearing Knix Teen underwear for over a year now and she refuses to wear anything else. Comfortable and give her (and I) peace of mind.”

- Lauren R

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Comfort-First Fit

Bikini silhouette with a classic mid-rise fit, medium hip and bum coverage. Designed specifically for teens and tweens, so may fit smaller than styles made for adults.

Worry-Free Protection

Our newest leakproof innovation provides more absorbency without the bulk. Patented 360 LeakSeal™ technology locks in leaks at every edge.

Absorbency Level: Moderate

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.

Discreet

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

Easy to Wash

100% reusable and machine washable, just like regular underwear.

Zoom

| Red Tulip/Scarlet/Super Pink
| Red Tulip/Scarlet/Super Pink
| Red Tulip/Scarlet/Super Pink
| Red Tulip/Scarlet/Super Pink

How to Choose?

Heavy

Drop
Drop
Drop
Drop
Drop
  • • Perfect for overnight protection or your teens heaviest days when changing into a fresh pair might not be convenient.
  • 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
  • • Ideal for lightest period days, spotting, 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
  • • Ideal for medium period days, discharge and 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
  • • Ultimate peace of mind. For the heaviest period days 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
LOVED BY TEENS. TRUSTED BY PARENTS. 

Why leakproof?

Built-in protection that helps teens feel secure on their period. The science behind the #1 Leakproof Brand in North America.

Soft Top Layer

Soft top layer

Comfy, super smooth moisture-wicking liner keeps you feeling fresh and dry.

Easy to Wash

100% reusable and machine washable, just like regular underwear.

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4.9
Rated 4.9 out of 5 stars
Based on 415 reviews
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415 reviews
  • Rated 5 out of 5 stars
    4 months ago
    Good quality product!

    We've tried several brands of period underwear and this is our favorite. The fit, the fun colors, the quality - the whole package. They really work. Leakproof! I tried XXS, but next time I'm going to get XS.

    Michelle H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 year ago
    Amazing

    Perfect for my teen daughter who plays sports She is a size 0 in pants and the size small fit perfect

    Rebecca C.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    11 months ago
    Bikini style

    Comfortable with a sleek profile under clothing. No-one would guess they are a leakproof panty when you are changing out of sports clothes in the women's change rooms. I will definitely buy more.

    Lesley H.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    11 months ago
    Leakproof underwear’s

    Very comfortable . Highly recommended

    Catherine U.
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    1 year ago
    5 Stars

    Love these, will buy agsin.

    Deb
    Verified Buyer
    Was this helpful?
  • Rated 5 out of 5 stars
    9 months ago
    Leakproof

    I love the fit of these!! And they work so well!!

    Michael C.
    Verified Buyer
    Was this helpful?

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