Teen Period Active

High-performance activewear to keep your teen moving with confidence—even on their period. No tampon required.

Dance

Leakproof styles for dancers so they can move, compete, and perform without distraction.

All Sizes in Stock

Active

Leakproof styles made to move with her through PE, practice, game day, dance class, and everything in between. Designed for active days and busy schedules, so she can stay focused on the fun—not her period. No tampon required.

Leakproof UltraThin No-Show Bikini

$25.00 CAD

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+9 +9

Leakproof Active Short

$45.00 CAD

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Leakproof Active Legging

$75.00 CAD

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First Serve Sport Dress

$95.00 CAD

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#1 Daytime Solution

Super Leakproof® No-Show Bikini

$29.00 CAD

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Leakproof Anti-Chafe Short

$39.00 CAD

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First Serve Pleated Skort

$65.00 CAD

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Made for everyday wear

Light Leakproof No-Show Bikini

$22.00 CAD

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+9 +9

First Serve Racerback Tank

$55.00 CAD

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Swim

Period swimwear made for laps, lessons, practices, and pool days. Designed to help her feel comfortable and confident in the water—even on her period—so she can focus on swimming, not worrying about leaks. No tampon required.

Best Seller

Period Swim Sport One-Piece

Period Swim Full-Coverage Bikini Bottom

$55.00 CAD

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Double Scoop Bikini Top

Period Swim Short

$60.00 CAD

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+4 +4

Racerback Tankini Swim Top

$55.00 CAD

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Best Seller

Period Swim Bikini Bottom

$55.00 CAD

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Your questions, answered.

What's the difference between Kt by Knix and Knix Activewear?

How does leakproof technology work?

Both our activewear and underwear feature our patented leakproof technology. There are 3 super thin layers in the liner that wick away moisture, rapidly absorb blood, sweat & discharge, all while working to keep in leaks. That means your teen can squat, sprint, stretch and move without peek-a-boo tampon strings, bulky pad seams or embarrassing leaks.

Does my teen need to wear a pad or tampon as backup?

That’s totally up to your teen! We have recommendations based on each product, but only your teen knows their flow and comfort levels.

Both the Leakproof Active Legging & Leakproof Active Short have a built-in liner with the holding power of 2 super tampons.

If your teen is wearing Kt’s Leakproof Leotard & Leakproof Tights, we suggest using them with a tampon or menstrual cup during their medium to heavy days. Wear them alone when you have a light flow.

How do I wash my teens activewear?

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

Step 2: Throw them in the washing machine with your regular clothes. Like-colors for activewear. 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 and activewear, or tumble dry on low for high to super absorbency underwear.

Step 4: That’s it! No ironing needed.

Order summary

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Teen Period Active

Filters

Dance

Full Coverage Leakproof Dance Underwear

Leakproof UltraThin No-Show Thong

StageProof™ Leakproof UltraThin Underwear

Leakproof Leotard

Active

Leakproof UltraThin No-Show Bikini

Leakproof Active Short

Leakproof Active Legging

First Serve Sport Dress

Super Leakproof® No-Show Bikini

Leakproof Anti-Chafe Short

First Serve Pleated Skort

Light Leakproof No-Show Bikini

First Serve Racerback Tank

Swim

Period Swim Sport One-Piece

Period Swim Full-Coverage Bikini Bottom

Double Scoop Bikini Top

Period Swim Short

Racerback Tankini Swim Top

Period Swim Bikini Bottom

Your questions, answered.

What's the difference between Kt by Knix and Knix Activewear?

How does leakproof technology work?

Does my teen need to wear a pad or tampon as backup?

How do I wash my teens activewear?

Shop by Category

Period Undies

Value Kits

Period Swim

Sleep

Dance

Leakproof Shortie