Period Swim Short - Long

You asked for longer lengths, and we delivered! Period Swim Short now available in a 5 ½ “ inseam length! The result? Your teen gets the period protection they need with the trending look they want.

Pair with matching Double Scoop Bikini Top

Go the distance with these max-coverage, extra-long swim shorts
Image of a absorbancy surrounding text
Absorbs about 2 super tampons worth of period blood
Image of a light and comfy surrounding text
Period Swim bottoms are designed to feel just like regular swimwear
Image of a machine washable surrounding text
Machine wash on cold and lay flat to dry

You asked for longer lengths, and we delivered! Period Swim Short now available in a 5 ½ “ inseam length! The result? Your teen gets the period protection they need with the trending look they want.

Pair with matching Double Scoop Bikini Top

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


Machine wash cold and lay flat to dry. Do not bleach, iron, or dry clean. 


Additional Product Ingredient Information

Eligible for a return or exchange within 30 days of delivery and with original sanitary strip and tags attached.

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.

FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
FOR THIS GENERATION
FOR THE PLANET
FOR REAL LIFE
nothing is TMI here—we promise.

Our period swim bottoms contain a triple-layer gusset that absorbs your flow and locks in leaks, whether you're in or out of the water. When they go in the wash with detergent, the blood releases through the top layer—leaving your swimwear fresh and clean for next time. Yes, your other clothes will remain stain-free!

Here's the breakdown of our 3-layer leakproof technology:

Layer 1: A silky-smooth top layer that sits comfortably against the skin.

Layer 2: A highly-absorbent middle layer designed with our leakproof technology to absorb up to 1-3 tampons worth of period blood.

Layer 3: A waterproof outer layer prevents swelling. 

Not always. When your flow is light, our swimwear can be worn alone without any additional period protection. On super heavy days, we recommend wearing a tampon or menstrual cup with your swimwear. Every period is different though, and we recommend doing whatever makes you feel most confident.

Machine wash cold and lay flat to dry. Do not bleach, iron, or dry clean.

Check out our size chart here

Yes! All of our regular price swim bottoms and one-pieces are eligible for a return or exchange within 30 days of delivery, as long as the original sanitary strip and tags are attached. Our swim tops are eligible for a return or exchange within 30 days of delivery with original tags attached.

Absolutely! The leakproof liner built into all of our period swimwear is undetectable, so they look and feel just like regular swimwear.

Our styles are made to fit teen bodies. For period swimwear in adult sizes, please visit Knix.

COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
JUST PLAIN BETTER
Reviews
average rating 4.3 out of 5
Based on 215 reviews
  • 5 Stars
    137 Reviews
  • 4 Stars
    40 Reviews
  • 3 Stars
    16 Reviews
  • 2 Stars
    7 Reviews
  • 1 Star
    15 Reviews
84% of reviewers would recommend this product to a friend
Review posted
Reviewed by rachael c.
Verified Buyer
Rated 5 out of 5

Shorts

Love them!!

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Reviewed by Tricia D.
Verified Buyer
Rated 5 out of 5

Love this style!

My tween loves these so much she even wears them when she’s not on her period!

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Reviewed by Leslie
Rated 5 out of 5

5 Stars

My daughter practically lives in these. She wishes the underwear shorts were just as long.

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Reviewed by Amber
Rated 5 out of 5

5 Stars

Daughter likes this very much!

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Reviewed by Janice T.
Verified Buyer
Rated 5 out of 5

They hold up to what they say they do

My daughter is a heavy bleeder so she was nervous about these working. But they do

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