Swim Essentials Period Kit
Periods and swimming fun can finally be friends! Let your teen soak up the sun (among other things) with this warm-weather-ready kit filled with 2 cute options of swimwear, plus 2 leakproof pairs of underwear.
What you get:
1 x Period Swim Sport One-Piece in Black
Discreet and absorbent liner that absorbs about 2 super tampons’ worth of period blood, medium bum coverage and a racerback style for comfort and style.
1 x Swim Short-Long in Black
Absorbs the equivalent of about 2-3 super tampons worth of blood
1 x 3-Pack Leakproof UltraThin No-Show Underwear in Guava/Festival Blue/Perfect Pear
Double up on Leakproof with a three-pack of bottoms that offer the classic underwear style they want with the period protection they need.
Periods and swimming fun can finally be friends! Let your teen soak up the sun (among other things) with this warm-weather-ready kit filled with 2 cute options of swimwear, plus 2 leakproof pairs of underwear.
What you get:
1 x Period Swim Sport One-Piece in Black
Discreet and absorbent liner that absorbs about 2 super tampons’ worth of period blood, medium bum coverage and a racerback style for comfort and style.
1 x Swim Short-Long in Black
Absorbs the equivalent of about 2-3 super tampons worth of blood
1 x 3-Pack Leakproof UltraThin No-Show Underwear in Guava/Festival Blue/Perfect Pear
Double up on Leakproof with a three-pack of bottoms that offer the classic underwear style they want with the period protection they need.
Machine wash cold and lay flat to dry. Do not bleach, iron, or dry clean.
Leakproof Underwear
Body: 77% Nylon, 23% Xtra Life Lycra
Lining: 86% Cotton, 10% Spandex, 4% Carbon
Gusset: Leakproof Technology®
Period Swim Sport One-Piece in Pink Pop
Body: 85% Nylon, 15% Spandex
Lining: 85% Nylon, 15% Spandex
Gusset: Fresh Fix Technology®, Polyurethane Film
Machine wash cold and lay flat to dry. Do not bleach, iron, or dry clean.
Swim Short-Long in Tropical Punch
Body: 85% Nylon, 5% Spandex
Interior Mesh: 86% Nylon, 14%Spandex
Fresh Fix Technology® Gusset: 85% Nylon, 15% Spandex; 93% Polyester, 7% Spandex; 87% Polyester, 13% Spandex; 100% PU Film
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.
Super Absorbency
Absorbs 9–12 tsp (45–60 ml) of blood—that’s about 9–12 regular tampons or pads! Perfect for overnight protection or your heaviest days when changing into a fresh pair might not be convenient.
High Absorbency
Absorbs 4–8 tsp (20–40 ml) of blood, or the equivalent of 4–8 tampons or pads. These are perfect for heavy flow days.
Medium Absorbency
Absorbs up to 3 tsp (15 ml), or about 3 tampons or pads worth of blood. Ideal for light to medium flow days or as backup to tampons or period cups.
All of our period underwear, swimwear, reusable pads, and activewear have our patented leakproof technology built right in.
First Layer: Moisture-wicking, antibacterial technology wicks away sweat and moisture while neutralizing odors to keep you fresh all day long.
Second Layer: A super thin, highly absorbent liner that holds the power of 3–20 tampons or pads.
Third Layer: A secure, liquid-resistant outer layer keeps leaks from happening.
The short answer: nope! Depending on the absorbency level of your period underwear and the heaviness of your flow, you can wear our period undies on their own or as a backup to tampons or menstrual cups. You can wear our High and Super absorbency underwear alone and be totally protected, while our Medium absorbency underwear can be worn alone on lighter days or as backup on heavier days.
Step 1: Give your 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.
*All Mystery Bundles are final sale.