Period Swim Twist High Rise Bikini Bottom

The main character on light days, and reliable backup on heavy days. It’s built with a super-absorbent gusset that absorbs period blood without swelling in the water. How? Oh, just our famous 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. 

 

Other Features:

- High rise with twist-front waistband

- Bum coverage: Medium

- Super-discreet liner

- 50+ UPF protection

- Pair with matching Double Scoop Bikini Top

 

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

Swim, splash, or sunbathe without ever having to struggle with tampons.
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Absorbs up to 1-3 regular tampons worth 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 on cold and lay flat to dry.

The main character on light days, and reliable backup on heavy days. It’s built with a super-absorbent gusset that absorbs period blood without swelling in the water. How? Oh, just our famous 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. 

 

Other Features:

- High rise with twist-front waistband

- Bum coverage: Medium

- Super-discreet liner

- 50+ UPF protection

- Pair with matching Double Scoop Bikini Top

 

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

Machine wash cold and lay flat to dry. Do not bleach, iron, or dry clean.


Body: 85% Nylon, 15% Spandex

Lining: 85% Nylon, 15% Spandex

Gusset: Fresh Fix Technology®, Polyurethane Film


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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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

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 4.5 out of 5
Based on 91 reviews
  • 5 Stars
    72 Reviews
  • 4 Stars
    6 Reviews
  • 3 Stars
    6 Reviews
  • 2 Stars
    2 Reviews
  • 1 Star
    5 Reviews
87% 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
91 Reviews
Reviewed by Kristin C.
Verified Buyer
I recommend this product
Band Size
32"
Pant Size
Teen 18-20
Size Purchased
M
Usage
  • Pool
Rated 5 out of 5
Review posted

Peace of mind

We have been worried about warmer weather with the first summer coming since my daughter started her period. She loves these undies and she was so relieved we found these for water activities.

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Quality
Rated 5 out of 5
Comfort
Rated 4 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?
Reviewed by Sandra F.
Verified Buyer
I recommend this product
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Band Size
30"
Pant Size
Kids 12-14
Size Purchased
S
Usage
  • Swim Class
  • Pool
  • Beach
  • Sun Bathing
Rated 5 out of 5
Review posted

Bikini Review

Very cute, but it was way to big for my daughter, both the top and bottom. I ended up selling it to my gf for her daughter. She really likes it! Its beautiful, she felt comfortable to go swimming. I have to reorder fir my girl! So it didn’t quite work out but she just bought it off me, instead of shipping back and forth! lol Its only my daughter’s 2nd period. She loves the boy shorts!!

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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?
Reviewed by ChyAnne H.
Verified Buyer
I recommend this product
Band Size
28"
Pant Size
Teen 4-10
Size Purchased
M
Usage
  • Pool
Rated 5 out of 5
Review posted

Great swim bottoms

Perfect for my 12 year old for spring break!

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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
Was this helpful?
Reviewed by Kimberlee G.
Verified Buyer
POS - Period Swim Twist High Rise Bikini Bottom
Reviewing
POS - Period Swim Twist High Rise Bikini Bottom
I recommend this product
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Band Size
N/A
Pant Size
Kids 16-20
Size Purchased
M
Usage
  • Sun Bathing
  • Pool
  • Beach
Rated 5 out of 5
Review posted

Super cute!

Purchased for my daughter and they were perfect. No leaks! Super cute! Quite high on the bum cheek.

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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
Was this helpful?
Reviewed by Karyn W.
Verified Buyer
I recommend this product
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Pant Size
Teen 4-10
Size Purchased
M
Band Size
N/A
Rated 5 out of 5
Review posted

Worked great

My teen liked the swim bottoms and felt comfortable not to worry about leaks

Loading...
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 5 out of 5
Was this helpful?