Start periods off with confidence. This kit comes with everything you need to be ready when that first period shows up. You get Light Leakproof for those days you’re not sure if it’s coming, Super Leakproof® for days you need no-leak confidence. And a Sleepover Short for sleeping soundly through the night.
What You Get:
3 Light Leakproof No-Show Underwear*
- Each pair absorbs about 1 regular tampons worth of blood, sweat or discharge.
3 Super Leakproof™ No-Show Underwear*
- Each pair absorbs about the same as 1.5 regular pads’ worth of blood.
1 Super Sleepover Short
- Absorbs about the same as 2.5 regular pads’ worth of blood.
1 Reusable Pouch
Start periods off with confidence. This kit comes with everything you need to be ready when that first period shows up. You get Light Leakproof for those days you’re not sure if it’s coming, Super Leakproof® for days you need no-leak confidence. And a Sleepover Short for sleeping soundly through the night.
What You Get:
3 Light Leakproof No-Show Underwear*
- Each pair absorbs about 1 regular tampons worth of blood, sweat or discharge.
3 Super Leakproof™ No-Show Underwear*
- Each pair absorbs about the same as 1.5 regular pads’ worth of blood.
1 Super Sleepover Short
- Absorbs about the same as 2.5 regular pads’ worth of blood.
1 Reusable Pouch
UltraThin Leakproof Underwear
Machine wash cold, do not bleach, do not iron, do not dry clean, lay flat to dry.
Body: 77% Nylon, 23% LYCRA® XTRA LIFE™Spandex;
Fresh Fix Technology®Gusset: Gusset 1: 86% Cotton, 10% Spandex, 4% Carbon; Gusset 2: 96% Polyester, 4% Spandex; Gusset 3: 83% Polyester, 11% Spandex, 6% Polyurethane
Super Leakproof Underwear
Body: 70% Nylon, 30% Spandex
Lining: 84% Modal, 8% Seaweed, 8% Spandex
Gusset: Leakproof Technology®, 100% Polyester, Polyurethane Film
Machine wash cold and tumble dry on low. Do not bleach, iron, or dry clean.
Super Sleepover Short
Body: 70% Nylon, 30% Spandex
Lining: 84% Modal, 8% Seaweed, 8% Spandex
Gusset: Leakproof Technology®, 100% Polyester, Polyurethane Film
Machine wash cold and tumble dry on low. Do not bleach, iron, or dry clean.
For additional product ingredient information click here.
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.
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.
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.
I placed an order for this kit and it did not include all the items. I have sent many emails back and forth and keep being told that I can not get what I ordered. Hopefully what I did receive will be useful but I am extremely frustrated by the order being incomplete and, according to customer service ,un-fixeable.
| KT Size | Hips | Kids Pant Size | Adult Pant Size |
|---|---|---|---|
| XXS | 25” - 27” | 7 | --- |
| XS | 28” - 30” | 8 - 10 | --- |
| S | 31” - 34” | 12 - 14 | 00 - 2 |
| M | 35” - 38” | 16 - 20 | 4 - 8 |
| L | 39” - 42” | --- | 10 - 14 |
| XL | 43” - 46” | --- | 16 - 18 |
| XXL | 47” - 50” | --- | 20 - 22 |
1. Hips
Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.Still Not Sure What Size To Get?
| KT Size | Band | Hips | Kids Pant Size | Adult Pant Size |
|---|---|---|---|---|
| XXS | 23 3/4" - 25 1/4" | 25” - 27” | 7 | --- |
| XS | 25 1/4" - 26 3/4" | 28” - 30” | 8 - 10 | --- |
| S | 26 3/4" - 28 1/4" | 31" - 34" | 12 - 14 | 00 - 2 |
| M | 28 1/4" - 29 3/4" | 35” - 38" | 16 - 20 | 4 - 8 |
| L | 29 3/4" - 31 1/2" | 39” - 42” | --- | 10 - 14 |
| XL | 31 1/2" - 33 1/2" | 43” - 46” | --- | 16 - 18 |
| XXL | 33 1/2" - 35 1/2" | 47” - 50” | --- | 20 - 22 |
1. Band
First, measure around the torso right below the breast
2. Hips
Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.
Still Not Sure What Size To Get?
| KT Size | Hips | Kids Pant Size | Adult Pant Size |
|---|---|---|---|
| XXS | 25” - 27” | 7 | --- |
| XS | 28” - 30” | 8 - 10 | --- |
| S | 31” - 34” | 12 - 14 | 00 - 2 |
| M | 35” - 38” | 16 - 20 | 4 - 8 |
| L | 39” - 42” | --- | 10 - 14 |
| XL | 43” - 46” | --- | 16 - 18 |
| XXL | 47” - 50” | --- | 20 - 22 |
1. Hips
Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.
Still Not Sure What Size To Get?
| KT Size | Band | Hips |
|---|---|---|
| XS | 28" | 25” - 27” |
| S | 30" | 28” - 30” |
| M | 32" | 31” - 35” |
| L | 34" | 36” - 40” |
| XL | 36" | 41” - 44” |
| XXL | 38" | 45” - 48” |
1. Band
First, measure around the torso right below the breast
2. Hips
KT Leotards are designed to sit on the hips, so measure around the widest part of the hips and refer to the chart above to find the best fit.
Still Not Sure What Size To Get?
| Size | Bust | Hips |
|---|---|---|
| XS | 27” | 25" - 27" |
| S | 30” | 28" - 30" |
| M | 34" | 31" - 35" |
| L | 37” | 36" - 40" |
| XL | 40” | 41" - 44" |
| XXL | 40” | 45" - 48" |
Still Not Sure What Size To Get?
| Size | Hips | Height | Weight |
|---|---|---|---|
| XS/S | 25" - 30" | 4'2" - 5'1" | 65 - 100 lbs |
| M/L | 31" - 40" | 4'9" - 5'6" | 105 - 130 lbs | XL/XXL | 41" - 48" | 4'11" - 5'6" | 135 - 170 lbs |
Still Not Sure What Size To Get?
| KT Size | Hips | Kids Pant Size | Adult Pant Size |
|---|---|---|---|
| XXS | 25” - 27” | 7 | --- |
| XS | 28” - 30” | 8 - 10 | --- |
| S | 31” - 34” | 12 - 14 | 00 - 2 |
| M | 35” - 38” | 16 - 20 | 4 - 8 |
| L | 39” - 42” | --- | 10 - 14 |
| XL | 43” - 46” | --- | 16 - 18 |
| XXL | 47” - 50” | --- | 20 - 22 |
1. Hips
Stand with your feet together and measure around the widest part of your hips and bottom. Keep the measuring tape parallel to the floor.Still Not Sure What Size To Get?
| Size | Under Bust (in) | Fits Cups |
|---|---|---|
| S | 26 3/4” - 28 1/4” | A-DD |
| M | 28 1/4” - 29 3/4” | A-DD |
| L | 29 3/4” - 31 1/2” | A-DD |
