Period Swim Full-Coverage Bikini Bottom

More comfortable with more coverage? We made these just for you. A mid-rise fit with fuller bum coverage than our regular bikini bottoms, and the leak-fighting power of about the same as 2-3 super tampons! Perfect for beach days, pool parties and all the hangouts you would’ve missed.

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 2-3 super tampons.

Layer 3: A waterproof outer layer never swells.

Other Features:

- Bum coverage: Full

- Fully lined

- Super-discreet liner

- 50+ UPF protection

- Pair with matching Double Scoop Bikini Top

Feel full of confidence in full-coverage swimwear.
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Absorbs about the same as 2-3 super 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.

More comfortable with more coverage? We made these just for you. A mid-rise fit with fuller bum coverage than our regular bikini bottoms, and the leak-fighting power of about the same as 2-3 super tampons! Perfect for beach days, pool parties and all the hangouts you would’ve missed.

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 2-3 super tampons.

Layer 3: A waterproof outer layer never swells.

Other Features:

- Bum coverage: Full

- Fully lined

- 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 4.5 out of 5
Based on 74 reviews
  • 5 Stars
    57 Reviews
  • 4 Stars
    10 Reviews
  • 3 Stars
    1 Review
  • 2 Stars
    2 Reviews
  • 1 Star
    4 Reviews
91% 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 Gabrielle L.
Verified Buyer
Period Swim Full-Coverage Bikini Bottom
Reviewing
Period Swim Full-Coverage Bikini Bottom
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Current Band Size
28
Pant Size
Kids 12-14
Size Purchased
M
Usage
  • Pool
Rated 5 out of 5

Perfect fit and very discreet

Perfect fit and very discreet. My daughter loved it.

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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 Erin B.
Verified Buyer
Period Swim Full-Coverage Bikini Bottom
Reviewing
Period Swim Full-Coverage Bikini Bottom
Height
5’6 – 5’8”
Usual Pant Size - Knixteen
Womens 4-8
Size Purchased - Knixteen Underwear
S
Rated 5 out of 5

Great fit!

Bought this for my Daughter- she has particular tastes-she loves it! Looks cute, fits well. Good quality.

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I recommend this product
Comfort
Rated 5 out of 5
Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
Effectiveness
Rated 5 out of 5
Ease of Use
Rated 5 out of 5
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Review posted
Reviewed by Deanne G.
Verified Buyer
Period Swim Full-Coverage Bikini Bottom
Reviewing
Period Swim Full-Coverage Bikini Bottom
Height
<5’5”
Usual Pant Size - Knixteen
Kids 8-10
Size Purchased - Knixteen Underwear
XXS
Rated 5 out of 5

Nice fit

My daughter loves these. They fit well and she likes the pattern on them.

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I recommend this product
Comfort
Rated 5 out of 5
Fit
Rated 0 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large
Effectiveness
Rated 5 out of 5
Ease of Use
Rated 5 out of 5
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Review posted
Reviewed by Amanda L.
Verified Buyer
Period Swim Full-Coverage Bikini Bottom
Reviewing
Period Swim Full-Coverage Bikini Bottom
Band Size
N/A
Pant Size
Teen 00-2
Size Purchased
S
Usage
  • Beach
Rated 5 out of 5

Incredible pirchase! Worth every penny

An absolute beach lifesaver!

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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 Abigail W.
Verified Buyer
Period Swim Full-Coverage Bikini Bottom
Reviewing
Period Swim Full-Coverage Bikini Bottom
Band Size
N/A
Pant Size
Teen 12-16
Size Purchased
M
Usage
  • Beach
  • Pool
Rated 5 out of 5

good 👍🏻

great quality

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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
Was this helpful?