Period-Proof Sport One-Piece

This sleek and sporty one-piece swimsuit is 50+ SPF protected, plus seawater- and chlorine-resistant, and made with our patented,  3-layer leakproof technology, plus an extra layer of waterproof fabric. 

First layer: Moisture-wicking, antimicrobial technology quickly absorbs sweat and moisture while neutralizing odors to keep you fresh all day long.
Second layer: A super thin, highly-absorbent liner that holds the power of 3 tampons.
Third layer: A secure, liquid-resistant outer layer keeps leaks from happening.
Fourth layer: Another thin layer of waterproof material for extra protection.

Wear it as backup with a tampon or menstrual cup on heavier days or wear it alone on lighter days.

even swim class won’t give away your period status.
Image of a absorbancy surrounding text
Holds up to 3 tampons or pads worth of blood.
Image of a moisture fabric surrounding text
Rapidly absorbs moisture to keep you fresh and dry all day.
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
Simple care with mild detergent and machine wash on cold.

This sleek and sporty one-piece swimsuit is 50+ SPF protected, plus seawater- and chlorine-resistant, and made with our patented,  3-layer leakproof technology, plus an extra layer of waterproof fabric. 

First layer: Moisture-wicking, antimicrobial technology quickly absorbs sweat and moisture while neutralizing odors to keep you fresh all day long.
Second layer: A super thin, highly-absorbent liner that holds the power of 3 tampons.
Third layer: A secure, liquid-resistant outer layer keeps leaks from happening.
Fourth layer: Another thin layer of waterproof material for extra protection.

Wear it as backup with a tampon or menstrual cup on heavier days or wear it alone on lighter days.

Body: 85% Nylon, 15% Spandex

Lining: 85% Nylon, 15% Spandex

Gussets: 

1. Hydrophilic + Waterproof Layer 100% Polyester with FreshFix™ Technology 

2. Waterproof Membrane Pu Film

Fabric is seawater and chlorine resistant and has 50+ SPF protection. 

Machine-wash cold, lay flat to dry. Do not bleach.

Eligible for a return or exchange within 30 days of delivery and with original sanitary strip and tags attached.

We ship our items via DHL, or Canada Post depending on your location. Please allow 1-2 business days for your order to dispatch.

For orders to Canada 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.

For orders to the US please allow 3-10 business days for orders to arrive.

For international orders please allow 10-25 business days.

NOTE: orders placed on Friday after 1 pm will not be processed until the following Monday.

Please see our Shipping page for more info.

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

All of our swimsuits have the same patented, 3-layer leakproof technology as our underwear plus an additional thin layer of waterproof material for extra protection. Here’s the breakdown.

First layer: Moisture-wicking, antimicrobial technology wicks away sweat and moisture while neutralizing odors to keep you fresh all day long.

Second layer: A super thin, highly-absorbent liner that holds the power of 3 tampons.

Third layer: A secure, liquid-resistant outer layer keeps leaks from happening.

Fourth layer: Another thin layer of waterproof material for extra protection.

KT Swimwear has a super discreet absorbent pad in the gusset liner that absorbs up to 3 tsps of blood, which equals about 3 tampons or pads.

Not always. When your flow is light, KT Swimwear can be worn alone without any additional period protection. On super heavy days,  the swimwear works great as backup protection with a tampon or menstrual cup. Every period is different though, and we recommend doing whatever makes you feel most confident.

The layers in the gusset of the underwear work to trap and absorb blood. We want you to feel 100% confident in your KT Swimwear, so if it is a super heavy flow day, we suggest wearing a tampon or menstrual cup with your suit.

Just machine-wash cold and lay flat to dry. Do not bleach.

Definitely. KT Swimwear is seawater and chlorine resistant, and has 50+ SPF protection!

If you’re not sure which size underwear to get, just book a Virtual Fitting and someone from the Knix team will video chat you to walk you through everything!

Yes. All KT Period-Proof Swim Bottoms and One-pieces are eligible for a return or exchange within 30 days of delivery and with original sanitary strip and tags attached. KT Period-Proof Swim Tops are eligible for a return or exchange within 30 days of delivery with original tags attached.

Absolutely. KT Swimwear looks and feels just like regular swimwear with a barely-there, leakproof liner.

Our styles are made to fit teen bodies. For Period-Proof Underwear in adult sizes, please visit Knix.com.

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 4.4 out of 5
Based on 84 reviews
  • 5 Stars
    61 Reviews
  • 4 Stars
    8 Reviews
  • 3 Stars
    9 Reviews
  • 2 Stars
    3 Reviews
  • 1 Star
    3 Reviews
87% of reviewers would recommend this product to a friend
Quality
Rated 4 out of 5
Comfort
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
Effectiveness
Rated 4 out of 5
84 Reviews
Reviewed by Amie E.
Verified Buyer
I recommend this product
I'm a...
Adult
I purchased for...
A Teenager/Tween
Band Size
N/A
Pant Size
Teen 12-16
Size Purchased
XL
Usage
  • Beach
Rated 3 out of 5
Review posted

Good Quality but...

Nice quality. However, my daughter is naturally modest and is most comfortable in a one peice. This fell very short in the coverage of her bottom. She's a very athletic and fit build, 5ft 6.5in, sz small in clothes, size XL in this suit. This should not have such a high cut that her cheeks are half out. A 12yr old shouldn't have such a hard time finding a full coverage bathing suit. So disappointing to be stuck with this. There's nothing wrong with wanting partial coverage if that's what you're comfy in. But why is there nothing available for pre teen girls who aren't there yet? Do better Knix, and have some suits for a range of young girls comfort level. I still would recommend it for girls who are comfortable with that style.

Loading...
Quality
Rated 5 out of 5
Comfort
Rated 2 out of 5
Effectiveness
Rated 3 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 France T.
Verified Buyer
I don't recommend this product
I'm a...
Parental Figure
I purchased for...
A Teenager/Tween
Band Size
30"
Pant Size
Teen 4-10
Size Purchased
L
Rated 3 out of 5
Review posted

Well made but bad cut

I bought this for my daughter. It is well made in the sense that the fabric and craftsmanship seem to be of top quality. However, the cut on the bum is too revealing for an eleven-year-old... I wish it covered her bum more.

Loading...
Quality
Rated 4 out of 5
Comfort
Rated 2 out of 5
Effectiveness
Rated 3 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 Julia
Verified Reviewer
I recommend this product
Rated 5 out of 5
Review posted

Perfect for Swimming Lessons!

My daughter is currently working on her Bronze Cross Certification. She doesn't feel comfortable wearing tampons and so we tried this bathing suit out and it's perfect! She hasn't had any leaks through her classes both in or outside of the pool and is absolutely in love! Definitely would recommend for swimming lessons!

Loading...
Was this helpful?
Reviewed by Olivia
Verified Reviewer
I recommend this product
Rated 5 out of 5
Review posted

It Actually Works

Ok, I was like most of you and thought "really, can this really work?!" Well believe me when I say it does! I've worn this on my period and I've never had any leaks in the water. It's amazing!

Loading...
Was this helpful?
Reviewed by DJ
Verified Buyer
I recommend this product
I'm a....
Parental Figure
I purchased for
A Teenager/Tween
Band Size
N/A
Pant Size
Teen 4-10
Size Purchased
L
Usage
  • Pool
Rated 3 out of 5
Review posted

Suit performs as advertised

I bought this for my daughter for swim practice. It "looks" like a competitive suit except is does have padding in the chest. My daughter did not like the way the suit felt in the water, but it did prevent leaks in the pool.

Loading...
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
Was this helpful?