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

 

MIX & MATCH, SAVE 10%: Purchase a swim top and bottom together and save 10% at checkout.

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.
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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.

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

 

MIX & MATCH, SAVE 10%: Purchase a swim top and bottom together and save 10% at checkout.

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. 


Additional Product Ingredient Information

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 $70. 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.


US Orders: Please allow 3–10 business days for orders to arrive.
International Orders: Please allow 10–25 business days for orders to arrive.


NOTE: Orders placed on Friday after 1 PM will not be processed until the following Monday.
CANADIAN CUSTOMERS: Shop www.knixteen.ca to order in Canadian currency.

 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. 

Yes! All of our regular price swim bottoms and one-pieces are eligible for a return or exchange within 30 days of delivery, as long as the original sanitary strip and tags are attached. Our swim tops are eligible for a return or exchange within 30 days of delivery with original tags attached.


All items purchased as part of the Kt Vault Sale are final sale, meaning no returns, exchanges or refunds can be accommodated. For non-sale items our standard return policy applies. 

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 4.3 out of 5
Based on 50 reviews
  • 5 Stars
    35 Reviews
  • 4 Stars
    7 Reviews
  • 3 Stars
    1 Review
  • 2 Stars
    3 Reviews
  • 1 Star
    4 Reviews
84% 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
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Review posted
Reviewed by Karrie R.
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
Band Size
N/A
Pant Size
Teen 4-10
Size Purchased
M
Usage
  • Pool
  • Beach
  • Sun Bathing
Rated 5 out of 5

Game changer

These have been fabulous for my daughter! She’s worn them as primary protection at pools, beaches and water parks with no issues. I was skeptical but we’ve been so pleased!

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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 Tia G.
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
Band Size
N/A
Pant Size
Teen 00-2
Size Purchased
S
Usage
  • Pool
  • Beach
  • Sun Bathing
Rated 5 out of 5

Fits as expected

Ordered according to the sizing chart and the bottoms fit perfect

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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 Andrea G.
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
Band Size
N/A
Pant Size
Kids 12-14
Size Purchased
XS
Usage
  • Pool
  • Swim Class
  • Beach
Rated 5 out of 5

Excellent quality and fits perfectly

Very pleased with the quality. The size guide was very accurate. Will buy again!

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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 Frances F.
Verified Buyer
Period Swim Full-Coverage Bikini Bottom
Reviewing
Period Swim Full-Coverage Bikini Bottom
Rated 5 out of 5

Swim

I bought for my daughter. She loves them. Not bulky like other period swim bottoms.

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Review posted
Reviewed by Megan
Verified Buyer
Period Swim Full-Coverage Bikini Bottom
Reviewing
Period Swim Full-Coverage Bikini Bottom
Usage
  • Pool
Rated 5 out of 5

Summer Saver!!!

I bought this suit bottom for my daughter for summer time. She ended up wearing it for the first time to a pool party and it worked perfectly! She wore it for hours with no leaks or worries. She loved it so much that I just ordered a second one for her. We got the black one and she just wears it with a top she already had. These bathing suits are truly a summer saver! I will be recommending these to everyone I know!

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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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