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.
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.

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. 

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.
Image of a chrome star surrounding text

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 213 reviews
  • 5 Stars
    137 Reviews
  • 4 Stars
    26 Reviews
  • 3 Stars
    11 Reviews
  • 2 Stars
    13 Reviews
  • 1 Star
    26 Reviews
79% 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 Jessica L.
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
  • Beach
Rated 5 out of 5

Wonderful product and company

I bought a few different pairs for my young daughter and these swim bottoms are amazing! The quality is great and there are no leakage concerns from her while swimming. Not only that, but one of the pairs was too small. It was SO easy to initiate an exchange. I would certainly purchase from Knix again in the future.

Loading...
I recommend this product
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Effectiveness
Rated 5 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
Was this helpful?
Review posted
Reviewed by tracee g.
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
Rated 5 out of 5

Such a great product!

Bought these for my 12 year old and she loves them so much that she wears them all the time and not just when she “has” to.

Loading...
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?
Review posted
Reviewed by Diana H.
Verified Buyer
Period Swim Bikini Bottom
Reviewing
Period Swim Bikini Bottom
Band Size
32"
Pant Size
Teen 12-16
Size Purchased
M
Usage
  • Pool
  • Beach
Rated 5 out of 5

Great for teenagers

These were great for my teenager who wants to swim but isn’t interested in wearing a tampon. She normally wears a small but a medium fit her perfect.

Loading...
I recommend this product
Quality
Rated 5 out of 5
Comfort
Rated 5 out of 5
Effectiveness
Rated 5 out of 5
Sizing
Rated -2 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 M S.
Verified Buyer
Period Swim Bikini Bottom
Reviewing
Period Swim Bikini Bottom
Rated 5 out of 5

Fantastic

Customer service and product is tops.

Loading...
I recommend this product
Was this helpful?
Review posted
Reviewed by Michelle S.
Verified Buyer
Period Swim Bikini Bottom
Reviewing
Period Swim Bikini Bottom
Rated 5 out of 5

Summer will be a breeze

This is going to change the summer, instead of not going swimming this giving safe and mess free options, love Knix!

Loading...
I recommend this product
Was this helpful?