Period Swim Freestyle One-Piece

Tuck Dives. Cannonballs. Lazy rivers. This leakproof swimsuit works as hard as they do. Both sporty and cute, it not only stops leaks, but fits like a glove, and offers a comfier, greater range of motion.


On light days, they can wear it alone. On heavy days, they can use it as backup with a tampon or menstrual cup. 

 

Key features:

- Feels just like regular swimwear

- Bum coverage: Medium

- Thin & undetectable period-absorbing gusset

- Anti-slip racerback straps for added mobility

- No shelf bra or padded cups for reduced drag

- 50+ UPF protection

- Fully lined 

Sleek, supportive, leak-fighting protection—all in one-piece.
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Holds about 3 regular pads’ worth of blood
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Designed by the former Canadian Olympic Apparel Designer
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Thin, discreet, and feels just like regular swimwear
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No bra pads for a smoother, closer fit

Tuck Dives. Cannonballs. Lazy rivers. This leakproof swimsuit works as hard as they do. Both sporty and cute, it not only stops leaks, but fits like a glove, and offers a comfier, greater range of motion.


On light days, they can wear it alone. On heavy days, they can use it as backup with a tampon or menstrual cup. 

 

Key features:

- Feels just like regular swimwear

- Bum coverage: Medium

- Thin & undetectable period-absorbing gusset

- Anti-slip racerback straps for added mobility

- No shelf bra or padded cups for reduced drag

- 50+ UPF protection

- Fully lined 

Body: 85% Nylon, 15% Spandex

Lining: 85% Nylon, 15% Spandex

Gusset: Leakproof Technology®, PU Film 


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

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 $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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When you purchase a swim top and bottom together, you’ll automatically save 10% at checkout.

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
Write a Review
average rating 3.9 out of 5
Based on 47 reviews
  • 5 Stars
    26 Reviews
  • 4 Stars
    5 Reviews
  • 3 Stars
    7 Reviews
  • 2 Stars
    4 Reviews
  • 1 Star
    5 Reviews
70% of reviewers would recommend this product to a friend
Quality
Rated 3 out of 5
Comfort
Rated 4 out of 5
Effectiveness
Rated 3 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
47 Reviews
Reviewed by Amber V.
Verified Buyer
POS - Period Swim Freestyle One-Piece
Reviewing
POS - Period Swim Freestyle One-Piece
I recommend this product
Band Size
N/A
Pant Size
Teen 00-2
Size Purchased
XS
Usage
  • Pool
  • Beach
Rated 5 out of 5
Review posted

My daughter LOVES this!

My daughter loves this bathing suit! The fit is perfect, the color is flattering, and you can't tell it's a period bathing suit. I'm very happy with this bathing suit and will definitely continue to purchase more bathing suits from KT by Knix!

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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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Reviewed by KARELLE
POS - Period Swim Freestyle One-Piece
Reviewing
POS - Period Swim Freestyle One-Piece
I recommend this product
Rated 5 out of 5
Review posted

5 Stars

Color is vibrant and beautiful and the size fits juste right, I am 5’5 and 120lbs and its perfect!

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Reviewed by Tsugumi K.
Verified Buyer
Period Swim Freestyle One-Piece
Reviewing
Period Swim Freestyle One-Piece
I recommend this product
I'm a...
Adult
I purchased for...
Myself
Pant Size
Teen 4-10
Size Purchased
M
Band Size
N/A
Rated 5 out of 5
Review posted

Fit small

I got this for myself. I feel it fit smaller than other style but still like it.

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Quality
Rated 5 out of 5
Comfort
Rated 4 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
Effectiveness
Rated 3 out of 5
Was this helpful?
Reviewed by Tsugumi K.
Verified Buyer
POS - Period Swim Freestyle One-Piece
Reviewing
POS - Period Swim Freestyle One-Piece
I recommend this product
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Pant Size
Kids 8-10
Size Purchased
XS
Band Size
N/A
Rated 5 out of 5
Review posted

Good quality

I got this for my 13 y old daughter. It’s a second one. she loves it.

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Quality
Rated 5 out of 5
Comfort
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
Effectiveness
Rated 3 out of 5
Was this helpful?
Reviewed by Susan P.
Verified Buyer
Period Swim Freestyle One-Piece
Reviewing
Period Swim Freestyle One-Piece
I recommend this product
Rated 5 out of 5
Review posted

Awkward Swim Classes no more!

Takes the awkward out of swim classes when your teen has her period. Wish I had this when I was younger!

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