Review posted
Reviewed by Adrienne
Reviewing
Period Swim Sport One-Piece
5 Stars
Beautiful swimsuit and has brought confidence back to my daughter.
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Period Swim Sport One-Piece
The one-piece that keeps selling out! Perfect for all swimmers, it can be worn alone on light days, or with a tampon or menstrual cup on heavy days, and won’t leak whether you’re in or out of the water. Designed with three layers to keep you cool, calm, and protected:
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 2 super tampons worth of period blood.
Layer 3: A waterproof outer layer prevents swelling.
Other Features:
- Fully lined
- Open racerback for better mobility
- Removable cups
- Bum coverage: Medium
- Super-discreet liner
- 50+ UPF protection
- Seawater and chlorine resistant
The #1 essential for swimming freely and fearlessly on your period.
Absorbs about 2 super tampons worth of blood.
Rapidly absorbs moisture to keep you fresh and dry.
Thin, subtle, and designed to feel just like regular swimwear.
Simply machine wash cold and lay flat to dry.
The one-piece that keeps selling out! Perfect for all swimmers, it can be worn alone on light days, or with a tampon or menstrual cup on heavy days, and won’t leak whether you’re in or out of the water. Designed with three layers to keep you cool, calm, and protected:
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 2 super tampons worth of period blood.
Layer 3: A waterproof outer layer prevents swelling.
Other Features:
- Fully lined
- Open racerback for better mobility
- Removable cups
- Bum coverage: Medium
- Super-discreet liner
- 50+ UPF protection
- Seawater and chlorine resistant
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
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 $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.
nothing is TMI here—we promise.
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.
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.
Reviews
Based on 322 reviews
88%
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
|
Review posted
Reviewed by Karen M.
Verified Buyer
Reviewing
Period Swim Sport One-Piece
Band Size
28"
Pant Size
Teen 12-16
Size Purchased
S
Usage
- Pool
- Beach
- Swim Class
Love it!
Bought for my 11 year old for swim team. It's a great fit and works well in the water. She has no complaints, so its a good thing.
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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
|
Was this helpful?
Review posted
Reviewed by Crystal F.
Verified Buyer
Reviewing
Period Swim Sport One-Piece
Band Size
38"
Pant Size
Teen 4-10
Size Purchased
L
Usage
- Pool
Amazing!
This was amazing! We were skeptical, but my daughter tried this out at a waterpark, and it worked fabulously!! Definitely worth the money!! It saved her vacation!
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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
|
Was this helpful?
Review posted
Reviewed by Alice R.
Verified Buyer
Reviewing
Period Swim Sport One-Piece
Band Size
N/A
Pant Size
Kids 12-14
Size Purchased
S
Usage
- Pool
Very happy with this suit!
Purchased for my 13 year old swimmer. She felt confident attending practice with this suit. She’s quite petite, so I was initially concerned about the sizing when I was ordering, but the suit fit well and she said it was comfortable.
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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
|
Was this helpful?
Review posted
Reviewed by Julia H.
Verified Buyer
Reviewing
Period Swim Sport One-Piece
Band Size
32"
Pant Size
Teen 4-10
Size Purchased
M
Usage
- Pool
- Swim Class
- Beach
- Sun Bathing
one piece suit
Great quality, fits my daughter very well!
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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
|
Was this helpful?