Period Swim Short - Long

Our most-requested swim style ever! Perfect for teens who want fuller coverage in the front and back, while being fully protected on their period. Wear it alone on light days, with a tampon or menstrual cup on heavy days or whatever works for your flow.

Other Features:
- Bum coverage: Max
- Wide waistband for comfort
- Mesh interior lining
- Super discreet liner

Pair with matching Double Scoop Bikini Top

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 240 reviews
  • 5 Stars
    155 Reviews
  • 4 Stars
    43 Reviews
  • 3 Stars
    17 Reviews
  • 2 Stars
    9 Reviews
  • 1 Star
    16 Reviews
84% of reviewers would recommend this product to a friend
Review posted
Reviewed by Lauri H.
Verified Reviewer
Rated 5 out of 5

Very happy

I liked the look of these online so decided to get the teen swim shorts even though I’m a 42 year old mom. I am very happy I did! I usually wear a size small in Knix clothing so I sized up to Medium in these. They are really flattering and super comfy! The gusset doesn’t feel uncomfortable or bunchy. Great product and incredibly fast shipping!

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Reviewed by Joslyn P.
Verified Buyer
Rated 5 out of 5

Super comfortable

My daughter feels so comfortable in these and true to size. She's happy that she can enjoy pool days!

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Reviewed by Sarah B.
Verified Buyer
Rated 5 out of 5

good quaility so far

The size lge fit my 11 1/2 year old daughter just right. She has worn them twice and they have done the job so far.

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Reviewed by Brittany E.
Verified Buyer
Rated 5 out of 5

Total lifesaver!

I bought these on a whim, not even knowing if my daughter would ever end up using them. Well, a couple weeks later, her period came the exact day we were going to go swimming so having them ended up working out perfectly. She had no leaks and could play comfortably all afternoon!

She’s 11, tall and slim and I usually buy her an XS in the underwear but since she’s right at the cusp of sizing up, I went for a Small so it should fit her next year too.

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Reviewed by Monique L.
Verified Buyer
(closed) Period Swim Short
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(closed) Period Swim Short
Rated 5 out of 5

Perfect for summer camp

My daughter loved these at summer camp. Will be buying more for next summer!

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