Starter Underwear 4-Pack

Get all of our best-selling styles in a variety of absorbency levels. You’ll get the full range of protection for light days to heavy days, and even at night when you’re sleeping.

What You Get:
- 1 Light Leakproof No-Show Underwear in Black* Each pair absorbs about the same as 1 regular tampon/pantyliners’ worth of blood.
- 1 Super Leakproof™ Underwear in Black Each pair absorbs about 3 super tampons' or 1.5 regular pads' worth of blood.
- 2 Super Leakproof™ Sleepover Short in Black Each pair absorbs about 5.5 super tampons' worth of period blood

*In your choice of Bikini, Boyshort, or High Rise.

All the protection they need for light days, heavy days, and everything in-between.
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Period protection that holds between 3–12 pads’ worth of blood
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Thin, subtle, and designed to feel just like regular underwear
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Rapidly absorbs moisture to keep you fresh and dry all day
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Sleepover Short features a longer gusset to prevent leaks all night

Get all of our best-selling styles in a variety of absorbency levels. You’ll get the full range of protection for light days to heavy days, and even at night when you’re sleeping.

What You Get:
- 1 Light Leakproof No-Show Underwear in Black* Each pair absorbs about the same as 1 regular tampon/pantyliners’ worth of blood.
- 1 Super Leakproof™ Underwear in Black Each pair absorbs about 3 super tampons' or 1.5 regular pads' worth of blood.
- 2 Super Leakproof™ Sleepover Short in Black Each pair absorbs about 5.5 super tampons' worth of period blood

*In your choice of Bikini, Boyshort, or High Rise.

Leakproof Underwear

Main Body: 77% Nylon, 23% LYCRA®

Gusset Liner: 86% Cotton, 10% Spandex, 4% Carbon

Gusset: Fresh Fix Technology®


Machine wash cold with mild detergent, do not bleach, lay flat to dry.


Super Leakproof Underwear

Main Body: 70% Nylon, 30% Spandex 

Gusset Top Layer (Moisture Wicking + Anti-Odor): 87% Seaweed Fiber, 13% Modal  

Gusset 2nd Layer (Absorbent Fabric): 100% Polyester  

Gusset 3rd Layer: Fresh Fix Technology®

Gusset 4th Layer (Waterproof Membrane): Polyurethane Film   


Machine wash cold with mild detergent, do not bleach, tumble dry on low. 


Super Sleepover Short

Main Body: 70% Nylon, 30% LYCRA® 

Gusset Top Layer (Moisture Wicking + Anti-Odor): 84% Modal, 8% Seaweed Fiber, 8% Spandex 

Gusset 2nd Layer (Absorbent Fabric): 100% Polyester 

Gusset 3rd Layer: Fresh Fix Technology®

Gusset 4th Layer (Waterproof Membrane): Polyurethane Film 


Machine wash cold with mild detergent, do not bleach, tumble dry on low.


Additional Product Ingredient Information

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.

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FOR REAL LIFE
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nothing is tmi here—we promise.
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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.

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ABSORBENT
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JUST PLAIN BETTER
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REUSABLE
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COMFORTABLE
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ABSORBENT
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JUST PLAIN BETTER
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REUSABLE
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COMFORTABLE
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ABSORBENT
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JUST PLAIN BETTER
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REUSABLE
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COMFORTABLE
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ABSORBENT
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JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
Image of a chrome heart surrounding text
ABSORBENT
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JUST PLAIN BETTER
Image of a chrome heart surrounding text
REUSABLE
Image of a chrome heart surrounding text
COMFORTABLE
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ABSORBENT
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JUST PLAIN BETTER
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REUSABLE
Reviews
average rating 3.0 out of 5
Based on 2 reviews
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Reviewed by Helena F.
Verified Reviewer
Usage
  • Back-up Protection
  • Primary Protection
  • Period
Rated 4 out of 5

Love them

I ordered this 3 pack in a size small. I am typically a 00 waist (24 inches). I love the underwear but I am a bit disappointed with the boxer style underwear, they seem to be a bit bigger than the other two. I wished I could have ordered a XS in the boxer style ones.

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Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Sizing
Rated 1 on a scale of minus 2 to 2, where minus 2 is Fits Small, 0 is True to SIze and 2 is Fits Large
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Rated 5 out of 5
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Reviewed by Isabella
Verified Reviewer
Usage
  • Back-up Protection
Rated 2 out of 5

Not fitting, no return possible

I bought xs new starter kit for my daughter. She is 13 but really thin and tall. The hip size fits but the cut on the butt is too large so she doesn’t feel confortable at all in those. I bought some mobody brand for her before that were way better! It’s really too bad we can’t exchange on top of that. Just wasted 100$.

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Quality
Rated 1 out of 5
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Rated 1 out of 5
Sizing
Rated 2 on a scale of minus 2 to 2, where minus 2 is Fits Small, 0 is True to SIze and 2 is Fits Large
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