Teen Period Underwear

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

  • Black
Super Leakproof® Sleepover Short
Heavy Absorbency
$38.25 CAD $45 CAD 15-40% OFF
  • Black
Leakproof UltraThin No-Show Underwear Bikini 3-Pack
Medium Absorbency
$45 CAD $75 CAD 15-40% OFF
New
  • Comet/Atmosphere/Starstruck
UltraThin Bikini: Holiday 3-Pack
Medium Absorbency
$52 CAD $75 CAD 30% OFF
  • Black
Light Leakproof No-Show Underwear Bikini 3-Pack
Light Absorbency
$59 CAD $66 CAD 15-40% OFF
  • Cosmo/Raspberry
Light Leakproof No-Show Underwear Bikini 2-Pack
Lightest Absorbency
$26 CAD $44 CAD 40% OFF
  • Black
Leakproof UltraThin No-Show Underwear Bikini
Medium Absorbency
$21.25 CAD $25 CAD 15-30% OFF
  • Black
Leakproof UltraThin No-Show Underwear Boyshort 3-Pack
Medium Absorbency
$63.75 CAD $75 CAD 15-40% OFF
  • Black
Super Leakproof® No-Show Underwear Bikini 3-Pack
Heavy Absorbency
$73.95 CAD $87 CAD 15-40% OFF
  • Black
Super Leakproof® Sleepover Short
Heavy Absorbency
$38.25 CAD $45 CAD 15-40% OFF
  • Black
Super Leakproof® No-Show Underwear Boyshort 3-Pack
Heavy Absorbency
$73.95 CAD $87 CAD 15-40% OFF
  • Black
Light Leakproof No-Show Underwear Boyshort 3-Pack
Light Absorbency
$56.10 CAD $66 CAD 15-40% OFF
  • Black
Super Leakproof® No-Show Underwear Bikini 2-Pack
Heavy Absorbency
$34 CAD $58 CAD 40% OFF
  • Black
Super Leakproof® No-Show Underwear Boyshort
Heavy Absorbency
$24.65 CAD $29 CAD 15-40% OFF
  • Black
Super Leakproof® No-Show Underwear Boyshort 2-Pack
Heavy Absorbency
$34 CAD $58 CAD 40% OFF
  • Lucky Star/Berry
Light Leakproof No-Show Underwear Boyshort 2-Pack
Lightest Absorbency
$26 CAD $44 CAD 40% OFF
  • Black
Light Leakproof No-Show Underwear Bikini
Lightest Absorbency
$18.70 CAD $22 CAD 15-40% OFF
  • Black
Light Leakproof No-Show Underwear Boyshort
Lightest Absorbency
$18.70 CAD $22 CAD 15-40% OFF
  • Black
Leakproof UltraThin No-Show Underwear Bikini
Medium Absorbency
$21.25 CAD $25 CAD 15-30% OFF
  • Black
Leakproof UltraThin No-Show Underwear Boyshort
Medium Absorbency
$21.25 CAD $25 CAD 15-30% OFF
  • Black
Leakproof Cotton Underwear Bikini
Medium Absorbency
$19.55 CAD $23 CAD 15% off
  • Black
Super Leakproof® No-Show Underwear Bikini
Heavy Absorbency
$24.65 CAD $29 CAD 15-40% OFF
  • Black
Super Leakproof® No-Show Underwear Boyshort
Heavy Absorbency
$24.65 CAD $29 CAD 15-40% OFF
  • Black
Light Leakproof No-Show Underwear High Rise
Lightest Absorbency
$22.10 CAD $26 CAD 15% OFF
  • Black
Super Leakproof® No-Show Underwear High Rise
Heavy Absorbency
$27.20 CAD $32 CAD 15% off
  • Black
Leakproof Luxe Modal Sleep Boxer
Medium Absorbency
$30.60 CAD $36 CAD 15-30% OFF
  • Black
Super Leakproof® No-Show Underwear Bikini
Heavy Absorbency
$24.65 CAD $29 CAD 15-40% OFF
Leakproof UltraThin No-Show Underwear 4-Pack - Bikini
Medium Absorbency
$70 CAD $100 CAD Save 15%
Leakproof UltraThin No-Show Underwear 4-Pack - Boyshort
Medium Absorbency
$70 CAD $100 CAD Save 15%
  • Black
Leakproof Front-to-Back Liner Underwear Bikini
Medium Absorbency
$34 CAD $40 CAD 15% off
  • Black
Travel Bag
$17 CAD $20 CAD 15% OFF
Light Leakproof No-Show Underwear 4-Pack - Bikini
Light Absorbency
$61.60 CAD $88 CAD 30% off
Light Leakproof No-Show Underwear 4-Pack - Boyshort
Light Absorbency
$61.60 CAD $88 CAD 30% off
Super Leakproof® Underwear 4-Pack - Bikini
Heavy Absorbency
$81.20 CAD $116 CAD Save 15%
Super Leakproof® Underwear 4-Pack - Boyshort
Heavy Absorbency
$81.20 CAD $116 CAD Save 15%
Super Leakproof® Underwear 4-Pack - Classic Prep
Heavy Absorbency
$98.60 CAD $116 CAD Save $17
Super Leakproof® Underwear 4-Pack - Y2K
Heavy Absorbency
$98.60 CAD $116 CAD Save $17
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 lightest, medium 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.


Medium Absorbency

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


Lightest 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.