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.
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Rapidly absorbs moisture to keep you fresh and dry.
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Thin, subtle, and designed to feel just like regular swimwear.
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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

Body: 85% Nylon, 15% Spandex

Lining: 85% Nylon, 15% Spandex

Gusset: Fresh Fix Technology®, Polyurethane Film


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

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 $80.

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. 

Canadian Orders: Please allow 2–4 business days for shipping to the GTA, 3–10 business days for urban areas, and 6–15 business days for remote locations.

NOTE: Orders placed on Friday after 1 PM will not be processed until the following Monday.

 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.
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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.

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
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
COMFORTABLE
ABSORBENT
JUST PLAIN BETTER
REUSABLE
Reviews
average rating 4.4 out of 5
Based on 318 reviews
  • 5 Stars
    228 Reviews
  • 4 Stars
    44 Reviews
  • 3 Stars
    23 Reviews
  • 2 Stars
    5 Reviews
  • 1 Star
    18 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 Mélanie B.
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
34
Pant Size
Kids 12-14
Size Purchased
S
Usage
  • Swim Class
Rated 5 out of 5

Superbe maillot

Le maillot est parfait, il est très utile lorsque ma fille a de la natation pendant ses règles. Jusqu’à présent elle est très satisfaite! De plus il lui va très bien et on ne voit pas de différence avec un maillot d’entraînement habituel.

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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 Randall H.
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
32
Pant Size
Teen 00-2
Size Purchased
S
Usage
  • Pool
  • Swim Class
Rated 5 out of 5

Amazing

My teen daughter loves this suit--as a competitive swimmer this has been a game changer!

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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 Rebecca G.
Verified Buyer
Period Swim Sport One-Piece
Reviewing
Period Swim Sport One-Piece
Band Size
N/A
Pant Size
Kids 12-14
Size Purchased
S
Usage
  • Pool
  • Swim Class
Rated 5 out of 5

Fits well.

The material is nice and durable. It as a good fit.

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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 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
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