Super Leakproof® Undershort

Home / Modesty + Backup Protection / Super Leakproof® Undershort

Bundle & Save

Super Leakproof® Undershort

$40.00 CAD

Buy 3+ SAVE 15%, Buy 5+ SAVE 20%

Absorbs about 4-7 super tampons

Full-coverage protection

Invisible under clothes

Machine washable

Heavy absorbency

Bundle & Save

Super Leakproof® Undershort

$40.00 CAD

Buy 3+ SAVE 15%, Buy 5+ SAVE 20%

Absorbs about 4-7 super tampons

Full-coverage protection

Invisible under clothes

Machine washable

Heavy absorbency

Absorbency: Heavy

Size:

True to Size

•

FREE Shipping on orders $80+

First Pair Risk-Free Policy

Leakproof Underwear is Sales Tax Free in Canada*

“My daughter cannot live without these shorts during her periods. She even wears them to school often, especially on her heavier days. They give her confidence and she doesn't need to worry about leaks.”

'- Kelly T.

Made for heavy days, modesty, backup protection and those “I think my period might be coming” days. With extra coverage and an extra-long leakproof liner, this soft short gives her protection she can wear to school, under clothes, around the house or to bed.

More Coverage, More Confidence

A soft, full-coverage short designed for teens and tweens. Wear it on its own or discreetly under clothes when she wants a little more coverage and reassurance.

Ready When Her Period Isn’t

Periods can be especially unpredictable in the first few years. She can wear these when she thinks her period might be coming, as backup protection, or anytime she wants to feel prepared.

Absorbency Level: Heavy

Our patented 3-layer leakproof technology and extra-long liner help protect against leaks from every angle. Absorbs about 4-7 super tampons—perfect for overnight protection and heavy flow days.

Discreet Under Clothes

Buttery-soft, comfortable and designed to disappear under clothes—including leggings. Full coverage for her period and for modesty, without everyone else knowing it’s there.

Day, Night & Everything Between

School day? Sleepover? Heavy flow? Waiting for her period to show up? One short designed to keep her covered through all of it.

Wear. Wash. Repeat.

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

The Perfect Fit

The fabric feels snug at first but relaxes after washing and wearing, resulting in a perfect fit.

Machine Washable

Wash with like colors on a cold cycle using a mild detergent. Do not bleach, dry clean, or iron. Lay flat to dry.

Fabric

Body: 70% Nylon, 30% Spandex; Gusset 1st Layer: 84% Modal, 8% Seaweed, 8% Spandex; Gusset 2nd Layer: 100% Polyester; Gusset 3rd Layer: Fresh Fix Technology®; Gusset 4th Layer: Polyurethane Film

Additional Product Ingredient Information

• Perfect for overnight protection or your teens heaviest days when changing into a fresh pair might not be convenient.

about 8-14 tsp
about 1.5-3 regular pads
about 4-7 super tampons
about 1.5-3 menstrual cups

• Ideal for lightest period days, spotting, sweat and discharge.

about 1-3 tsp
about 1-3 pantyliners
about 1-3 regular tampons
about 0.5 menstrual cups

• Ideal for medium period days, discharge and sweat.

about 4-8 tsp
about 1-1.5 regular pads
about 2-4 super tampons
about 0.5-3 menstrual cups

• Our longest front-to-back liner, designed for their heaviest flow days and overnight protection.

about 15-20 tsp
about 1.5-2.5 super pads
about 7-11 super tampons
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

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

Middle absorbent layer

Bottom leakblocker layer

How to wash

Easy to Wash

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

Your questions, answered.

How do I wash period underwear?

It's easy, we promise. Give them a quick rinse under cold water first, then toss them in the washing machine with your regular clothes, cold water, mild detergent, no softener or bleach. For drying: lay flat for medium absorbency styles, or tumble dry on low for high and super absorbency ones. That's it. No ironing needed!

Are leakproof products tax-free?

Good news, period underwear and pads are exempt from federal sales tax in Canada, and most provincial/harmonized sales taxes too. The exception? If your order ships to (or you're shopping in a store in) British Columbia or Manitoba, a 7% PST applies. Saskatchewan, it's 6% PST. Still have questions? We've got more info here.

How does period underwear work?

What do the absorbency levels mean?

Ultra: Absorbs the equivalent of 7-11 super tampons. Our longest front-to-back liner, designed for their heaviest flow days and overnight protection.

Heavy: Absorbs the equivalent of 4–7 super tampons. Great for overnight or the heaviest days when swapping into a fresh pair isn't always an option.

Moderate: Absorbs about 2.5 super tampons' worth. A solid go-to for medium flow days, discharge, and sweat.

Light: Absorbs about 1 regular tampon's worth. Perfect for spotting, lightest days, discharge, and sweat.

Does my teen need to wear a pad or tampon with period underwear?

Totally up to them! Every flow is different, and there's no wrong answer. Depending on the absorbency level and how heavy their period is, they can wear KT undies on their own or use them as backup alongside a tampon or menstrual cup. Whatever makes them feel most confident is the right call.

Order summary

Suggestions

Top Picks

Light Leakproof Cotton Bikini Underwear

Super Leakproof® Sleepover Boxer

SuperPlus Leakproof® Sleepover Short

Light Leakproof No-Show Boyshort

Super Leakproof® Undershort

Super Leakproof® Undershort

Super Leakproof® Undershort

Absorbency: Heavy Drop Drop Drop Drop Drop

Size and Fit Guide

Shipping

Shipping

First Pair Risk Free for 30 Days

First Pair Risk-Free Policy

Leakproof Underwear is Sales Tax Free in Canada

“My daughter cannot live without these shorts during her periods. She even wears them to school often, especially on her heavier days. They give her confidence and she doesn't need to worry about leaks.”

Build Your Bundle & Save

More Coverage, More Confidence

Ready When Her Period Isn’t

Absorbency Level: Heavy

Discreet Under Clothes

Day, Night & Everything Between

Wear. Wash. Repeat.

Zoom

How to Choose?

Heavy

Light

Moderate

Ultra

Why leakproof?

Soft top layer

Middle absorbent layer

Bottom leakblocker layer

How to wash

Easy to Wash

Recently Viewed

Explore Best-Sellers

SuperPlus Leakproof® Sleepover Short

Period Swim Sport One-Piece

Super Leakproof® Sleepover Boxer

First Period Kit - Bikini

Light Leakproof Cotton Bikini Underwear

Full Coverage Leakproof Dance Underwear

Light Leakproof No-Show Bikini 3-Pack

Racerback Tankini + Swim Short Set

Your questions, answered.

How do I wash period underwear?

Are leakproof products tax-free?

How does period underwear work?

What do the absorbency levels mean?

Does my teen need to wear a pad or tampon with period underwear?

Can I return my period underwear?

Absorbency: Heavy