Period Swim Sport One-Piece

The one-piece that keeps selling out! Perfect for all swimmers, it can be worn alone on light days, or with a tampon or menstrual cup on heavy days, and won’t leak whether you’re in or out of the water. Designed with three layers to keep you cool, calm, and protected:

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 about 2 super tampons worth of period blood.

Layer 3: A waterproof outer layer prevents swelling.


Other Features:

- Fully lined

- Open racerback for better mobility

- Removable cups

- Bum coverage: Medium

- Super-discreet liner

- 50+ UPF protection

- Seawater and chlorine resistant

The #1 essential for swimming freely and fearlessly on your period.
Image of a absorbancy surrounding text
Absorbs about 2 super tampons worth of blood.
Image of a moisture fabric surrounding text
Rapidly absorbs moisture to keep you fresh and dry.
Image of a light and comfy surrounding text
Thin, subtle, and designed to feel just like regular swimwear.
Image of a machine washable surrounding text
Simply machine wash cold and lay flat to dry.

The one-piece that keeps selling out! Perfect for all swimmers, it can be worn alone on light days, or with a tampon or menstrual cup on heavy days, and won’t leak whether you’re in or out of the water. Designed with three layers to keep you cool, calm, and protected:

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 about 2 super tampons worth of period blood.

Layer 3: A waterproof outer layer prevents swelling.


Other Features:

- Fully lined

- Open racerback for better mobility

- Removable cups

- Bum coverage: Medium

- Super-discreet liner

- 50+ UPF protection

- Seawater and chlorine resistant

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


Body: 85% Nylon, 15% Spandex

Lining: 85% Nylon, 15% Spandex

Gusset: Fresh Fix Technology®, Polyurethane Film


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.

 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 4.4 out of 5
Based on 337 reviews
  • 5 Stars
    242 Reviews
  • 4 Stars
    46 Reviews
  • 3 Stars
    23 Reviews
  • 2 Stars
    5 Reviews
  • 1 Star
    21 Reviews
88% of reviewers would recommend this product to a friend
Quality
Rated 4 out of 5
Comfort
Rated 4 out of 5
Effectiveness
Rated 4 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Fits Small, 0 is True to Size and 2 is Fits Large
Write a Review
Review posted
Reviewed by Elaina A.
Verified Buyer
Period Swim Sport One-Piece
Reviewing
Period Swim Sport One-Piece
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Current Band Size
40
Pant Size
Teen 18-20
Size Purchased
M
Usage
  • Swim Class
Rated 5 out of 5

Great for pre-teen to feel secure

Ordered several of these for my daughter (11) for swim class and she loves them! they feel great and no leaks! (actually kinda amazing). I'll order more when she needs them, love them!

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I recommend this product
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Effectiveness
Rated 5 out of 5
Sizing
Rated 0 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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Review posted
Reviewed by Chantal J.
Verified Buyer
Period Swim Sport One-Piece
Reviewing
Period Swim Sport One-Piece
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Current Band Size
28
Pant Size
Kids 12-14
Size Purchased
S
Usage
  • Pool
Rated 5 out of 5

Parfait

Il est tout simplement parfait

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I recommend this product
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Effectiveness
Rated 5 out of 5
Sizing
Rated 0 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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Review posted
Reviewed by Lida I.
Verified Buyer
Period Swim Sport One-Piece
Reviewing
Period Swim Sport One-Piece
Band Size
N/A
Pant Size
Teen 4-10
Size Purchased
M
Usage
  • Swim Class
Rated 5 out of 5

Swimsuit

Excellent quality and true to size.

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I recommend this product
Quality
Rated 5 out of 5
Comfort
Rated 4 out of 5
Effectiveness
Rated 5 out of 5
Sizing
Rated 0 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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Review posted
Reviewed by Cosmin V.
Verified Buyer
Period Swim Sport One-Piece
Reviewing
Period Swim Sport One-Piece
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Current Band Size
36
Pant Size
Teen 12-16
Size Purchased
L
Usage
  • Swim Class
Rated 5 out of 5

M.

Nice quality. Didn’t try yet but the size match perfectly. Thank you for your business.

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I recommend this product
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Effectiveness
Rated 4 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Fits Small, 0 is True to Size and 2 is Fits Large
Was this helpful?
Review posted
Reviewed by Lori S.
Verified Buyer
Period Swim Sport One-Piece
Reviewing
Period Swim Sport One-Piece
Band Size
36"
Pant Size
Teen 12-16
Size Purchased
M
Usage
  • Beach
Rated 5 out of 5

Worked Beautifully!!!

Bought this suit (plus your boyshort and board shorts) for summer camp for my daughter. Worked perfectly!! As expected, she got her period 1/2 way through camp. She said she spent every day in the lake without a worry! Thank you!! Before these, she would have opted out of water activities at camp.

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I recommend this product
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Effectiveness
Rated 5 out of 5
Sizing
Rated 0 on a scale of minus 2 to 2, where minus 2 is Fits Small, 0 is True to Size and 2 is Fits Large
Was this helpful?