Period Swim Bikini Bottom

Period? No problem. These bottoms let you swim with confidence, not discomfort. You can wear them alone or as backup protection to tampons and menstrual cups. Designed with three layers of 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 about the same as 1-3 regular tampons of period blood.

Layer 3: A waterproof outer layer prevents swelling.

Other Features:

- Classic bikini cut

- Bum coverage: Medium

- Super discreet liner

- 50+ UPF protection

- Pair with matching Double Scoop Bikini Top

Finally, a swim bottom you can cannonball in, even on your period.
Image of a absorbancy surrounding text
Absorbs about the same as 1-3 regular tampons of period blood.
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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.

Period? No problem. These bottoms let you swim with confidence, not discomfort. You can wear them alone or as backup protection to tampons and menstrual cups. Designed with three layers of 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 about the same as 1-3 regular tampons of period blood.

Layer 3: A waterproof outer layer prevents swelling.

Other Features:

- Classic bikini cut

- Bum coverage: Medium

- Super discreet liner

- 50+ UPF protection

- Pair with matching Double Scoop Bikini Top

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 4.1 out of 5
Based on 220 reviews
  • 5 Stars
    144 Reviews
  • 4 Stars
    26 Reviews
  • 3 Stars
    11 Reviews
  • 2 Stars
    13 Reviews
  • 1 Star
    26 Reviews
80% 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 Rebecca C.
Verified Buyer
Period Swim Bikini Bottom
Reviewing
Period Swim Bikini Bottom
Band Size
N/A
Pant Size
Teen 00-2
Size Purchased
S
Usage
  • Pool
  • Sun Bathing
  • Beach
Rated 5 out of 5

Perfect for swim

Perfect option for swimming. Fit was great. Size small fit my teen who is a size 0 in pants

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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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Reviewed by Jojo
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Period Swim Bikini Bottom
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Period Swim Bikini Bottom
Rated 5 out of 5

Swim Bottoms

I bought 3 leakkproof bikini swimming bottoms. They fit perfectly under mybathing suit, and I can enjoy my waterexercise class without embarassment. Thanks, Knix!

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Reviewed by Marie-Christine L.
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(closed) Period Swim Bikini Bottom
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Rated 5 out of 5

Finally a period solution for swimming season!

it's the perfect combo of safety and comfort, I like those

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Reviewed by Chantal P.
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Period Swim Bikini Bottom
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Period Swim Bikini Bottom
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Band Size
N/A
Pant Size
Kids 12-14
Size Purchased
S
Rated 5 out of 5

Swim bottom

My daughter went to pool parties and camping with confidence this summer! Thank you for making summer periods a non-issue

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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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Reviewed by Elizabeth R.
Verified Buyer
(closed) Period Swim Bikini Bottom
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Rated 5 out of 5

Vacation saver!

Purchased these and another style for my teen who was going to get her period during our vacation. Not feeling comfortable with using tampons I went on the hunt for period friendly options. These were a lifesaver for her. She didn't worry about any leaking while swimming. They worked great. I went ahead and ordered her the size according to some other reviews and they fit great. Highly recommend!

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