Teen Period Underwear

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Moisture-wicking, odor-crushing, life-changing leakproof undies.

Super Leakproof® Sleepover ShortSuper Leakproof® Sleepover Short
  • Mood Ring
  • Black
  • Night Sky
  • Cosmo
  • Electric Orchid
  • Marina
  • Energize
  • Guava
  • +4
Super Leakproof® Sleepover Short
Heavy Absorbency
$45.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Leakproof UltraThin No-Show Underwear Bikini 3-PackLeakproof UltraThin No-Show Underwear Bikini 3-Pack
  • Picnic Plaid/Cosmo/Ultra Violet
  • Black
  • Night Sky/Limeade/Heather Grey
  • Electric Orchid/Teal Appeal/Lagoon
  • Energize/Marina/Highlight
  • Blueberry/Holly/Galaxy
  • Ruby/Sugar Plum/Posy
  • Gumdrop/Blueberry/Blue Gingham
  • +5
  • +1
Leakproof UltraThin No-Show Underwear Bikini 3-Pack
Moderate Absorbency
$67.00 CAD $75 Save 10%
Super Leakproof® No-Show Underwear BikiniSuper Leakproof® No-Show Underwear Bikini
  • Marina
  • Black
  • Beige
  • Night Sky
  • Electric Orchid
  • Mood Ring
  • Cosmo
  • Perfect Pear
  • +6
  • +2
Super Leakproof® No-Show Underwear Bikini
Heavy Absorbency
$29.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Leakproof Thigh Saver®Leakproof Thigh Saver®
UNDER-OUTFIT CONFIDENCE
  • Black
  • Petal Party
Leakproof Thigh Saver®
Light Absorbency
$39.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Super Leakproof® No-Show Underwear Bikini 3-PackSuper Leakproof® No-Show Underwear Bikini 3-Pack
  • Picnic Plaid/Cosmo/Ultra Violet
  • Black
  • Electric Orchid/Teal Appeal/Lagoon
  • Energize/Marina/Highlight
  • Night Sky/Beige/Black
  • Gumdrop/Blueberry/Black
  • +2
Super Leakproof® No-Show Underwear Bikini 3-Pack
Heavy Absorbency
$77.00 CAD $87 Save 10%
Leakproof UltraThin No-Show Underwear BikiniLeakproof UltraThin No-Show Underwear Bikini
  • Marina
  • Black
  • Electric Orchid
  • Cosmo
  • Beige
  • Night Sky
  • Galaxy
  • Perfect Pear
  • +4
Leakproof UltraThin No-Show Underwear Bikini
Moderate Absorbency
$25.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Light Leakproof No-Show Underwear Boyshort 3-PackLight Leakproof No-Show Underwear Boyshort 3-Pack
  • Electric Orchid/Teal Appeal/Lagoon
  • Black
  • Night Sky/Beige/Black
  • Energize/Marina/Highlight
  • Picnic Plaid/Cosmo/Ultra Violet
  • Ruby/Sugar Plum/Posy
  • Lemon Sorbet/Ballet Pink/Lemonade
  • Night Sky/Limeade/Heather Grey
  • +4
Light Leakproof No-Show Underwear Boyshort 3-Pack
Light Absorbency
$59.00 CAD $66 Save 10%
Super Leakproof® No-Show Underwear BoyshortSuper Leakproof® No-Show Underwear Boyshort
  • Cosmo
  • Black
  • Beige
  • Night Sky
  • Electric Orchid
  • Marina
  • Mood Ring
  • Galaxy
  • +5
  • +1
Super Leakproof® No-Show Underwear Boyshort
Heavy Absorbency
$29.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Leakproof Cotton Underwear Bikini 3-PackLeakproof Cotton Underwear Bikini 3-Pack
Leakproof Cotton Underwear Bikini 3-Pack
Moderate Absorbency
$62.10 CAD $69 Save 10%
Light Leakproof No-Show Underwear BikiniLight Leakproof No-Show Underwear Bikini
  • Electric Orchid
  • Black
  • Beige
  • Night Sky
  • Cosmo
  • Marina
  • Chasing Butterflies
  • +3
Light Leakproof No-Show Underwear Bikini
Light Absorbency
$22.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Super Leakproof® No-Show Underwear BikiniSuper Leakproof® No-Show Underwear Bikini
  • Beige
  • Black
  • Night Sky
  • Electric Orchid
  • Mood Ring
  • Cosmo
  • Marina
  • Perfect Pear
  • +6
  • +2
Super Leakproof® No-Show Underwear Bikini
Heavy Absorbency
$29.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Super Leakproof® No-Show Underwear Boyshort 3-PackSuper Leakproof® No-Show Underwear Boyshort 3-Pack
  • Electric Orchid/Teal Appeal/Lagoon
  • Black
  • Night Sky/Beige/Black
  • Energize/Marina/Highlight
  • Picnic Plaid/Cosmo/Ultra Violet
  • +1
Super Leakproof® No-Show Underwear Boyshort 3-Pack
Heavy Absorbency
$77.00 CAD $87 Save 10%
Leakproof Luxe Modal Sleep BoxerLeakproof Luxe Modal Sleep Boxer
  • Energize
  • Black
  • Electric Orchid
Leakproof Luxe Modal Sleep Boxer
Moderate Absorbency
$36.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Light Leakproof No-Show Underwear BoyshortLight Leakproof No-Show Underwear Boyshort
  • Marina
  • Black
  • Beige
  • Night Sky
  • Electric Orchid
  • Cosmo
  • +2
Light Leakproof No-Show Underwear Boyshort
Light Absorbency
$22.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Leakproof UltraThin No-Show Underwear BoyshortLeakproof UltraThin No-Show Underwear Boyshort
  • Cosmo
  • Black
  • Electric Orchid
  • Marina
  • Beige
  • Night Sky
  • Galaxy
  • +3
Leakproof UltraThin No-Show Underwear Boyshort
Moderate Absorbency
$25.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Leakproof UltraThin No-Show Underwear Boyshort 3-PackLeakproof UltraThin No-Show Underwear Boyshort 3-Pack
  • Energize/Marina/Highlight
  • Black
  • Electric Orchid/Teal Appeal/Lagoon
  • Picnic Plaid/Cosmo/Ultra Violet
  • Ruby/Sugar Plum/Posy
  • Gumdrop/Blueberry/Blue Gingham
  • Blueberry/Holly/Galaxy
  • Night Sky/Limeade/Heather Grey
  • +4
Leakproof UltraThin No-Show Underwear Boyshort 3-Pack
Moderate Absorbency
$67.00 CAD $75 Save 10%
Leakproof Thigh Saver®Leakproof Thigh Saver®
  • Petal Party
  • Black
Leakproof Thigh Saver®
Light Absorbency
$39.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Light Leakproof No-Show Underwear Bikini 3-PackLight Leakproof No-Show Underwear Bikini 3-Pack
  • Electric Orchid/Teal Appeal/Lagoon
  • Black
  • Night Sky/Beige/Black
  • Energize/Marina/Highlight
  • Picnic Plaid/Cosmo/Ultra Violet
  • Blueberry/Holly/Galaxy
  • Lemon Sorbet/Ballet Pink/Lemonade
  • Night Sky/Limeade/Heather Grey
  • +4
Light Leakproof No-Show Underwear Bikini 3-Pack
Light Absorbency
$59.00 CAD $66 Save 10%
Leakproof Cotton Underwear BikiniLeakproof Cotton Underwear Bikini
  • Black
  • Pepper
  • Night Sky
Leakproof Cotton Underwear Bikini
Moderate Absorbency
$23.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Super Leakproof® No-Show Underwear High RiseSuper Leakproof® No-Show Underwear High Rise
  • Black
Super Leakproof® No-Show Underwear High Rise
Heavy Absorbency
$32.00 CAD Buy 4+ Save 15%, Buy 7+ Save 25%
Travel BagTravel Bag
HOLDS UP TO 7 PAIRS
  • Black
Travel Bag
$20.00 CAD
Leakproof UltraThin Bikini Gift Box 3-PackLeakproof UltraThin Bikini Gift Box 3-Pack
  • Comet/Atmosphere/Starstruck
Leakproof UltraThin Bikini Gift Box 3-Pack
Moderate Absorbency
$67.00 CAD $75 Save 10%
nothing is tmi here—we promise.
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Period underwear and pads are exempt from federal sales tax in Canada. They are also exempt from most provincial / harmonized sales taxes. But are subject to the following provincial sales tax rates which will apply to orders shipped to the following provinces and to orders purchased in retail stores located in the following provinces: British Columbia and Manitoba: 7% PST; Saskatchewan: 6% PST. 

Need more info? Click here

Each pair has a built-in liner that absorbs period blood. Kt Period Underwear is categorized by light, moderate and heavy flows so you can find the right pair for your teen’s needs.

Heavy Absorbency

Absorbs about the same as 3 super tampons. Perfect for overnight protection or your teens heaviest days when changing into a fresh pair might not be convenient.


Moderate Absorbency

Absorbs about 2.5 super tampons' worth of blood. Ideal for medium period days, discharge and sweat.


Light Absorbency

Absorbs about the same as about 1 regular tampon worth of blood, sweat or discharge. Ideal for lightest period days, spotting, sweat and discharge.

All of our period underwear, swimwear, reusable pads, and activewear have our patented leakproof technology built right in. Liner’s are discreet and comfortable, and fit for your teen’s unique flow. 

That’s up to your teen or tween! Every flow and comfort level is different.

Depending on the absorbency level of the period underwear and the heaviness of your teen’s flow, they can wear our period undies on their own or as a backup to tampons or menstrual cups. 

We always recommend they choose an option that makes them feel most confident!

Step 1: Give your teens underwear a quick rinse under cold water.

Step 2: Throw it in the washing machine with your regular clothes. Wash on cold with mild detergent (no softener or bleach).

Step 3: There are two ways to dry them depending on the undies you have: lay flat to dry for medium absorbency products, or tumble dry on low for high to super absorbency products.

Step 4: That’s it! No ironing needed.

Check out our size chart here. If you want some help, we have virtual fitters ready on deck to help you find your perfect fit. Book a video call with them today.

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 standard refund (excluding original shipping fees).

All unopened packages will be donated to local organizations to support people in need.