First Serve Racerback Tank
or 4 installments of $11.25 by 
ⓘ
Notify me when this product is back in stock
Move freely and keep cool in this lightweight racerback tank.
This top has a high neck for extra coverage and an interior shelf bra.
Pair it with your go-to Period Active bottoms and get ready to sweat.
Other Features:
- Built-in shelf bra
- Quick-drying, breathable fabric
- Racerback
- Made to pair with your favorite Period Active bottoms
Body: 80% Nylon, 20% Spandex
Interlining: 90% Polyester, 10% Spandex, Exclusive of Decoration
Machine Wash Cold, Do Not Bleach, Tumble Dry Low, Do Not Iron, Do Not Dry Clean
For items with a 20% or more discount, you may exchange for another item or return for store credit. No refunds can be accommodated.
Items marked as “Flash Sale” or “Clearance” are final sale, meaning no returns, exchanges or refunds can be accommodated. No exceptions.
Please note: Sale items are not eligible for our First Pair Risk-Free Policy.
We offer free standard shipping on all orders over $70. We ship our items via DHL or Canada Post depending on your location. Please allow 1-2 business days for your items to be processed and shipped. During high volume periods, your order may take up to 7 business days to dispatch from our warehouse location.
US Orders: Please allow 3–10 business days for orders to arrive.
International Orders: Please allow 10–25 business days for orders to arrive.
NOTE: Orders placed on Friday after 1 PM will not be processed until the following Monday.
CANADIAN CUSTOMERS: Shop www.knixteen.ca to order in Canadian currency.
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.
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.
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.
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.
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.
Yes! You can return or exchange within 30 days of delivery, as long as the tags are still attached.
Our collection is made to fit teen bodies. For period-proof activewear in adult sizing, please visit Knix.