onewith swimonewith swim onewith is a women’s swimwear brand reinventing the way swimsuits fit, feel, and function. Founded in Connecticut, we appeared on Shark Tank and got a deal in 2025. onewith created swim that fits like undies: swimwear designed to feel as comfortable, flexible, and dig-free as your favorite seamless underwear, while still being intentionally made for the water. Unlike traditional swimwear that often relies on tight elastic seams, squeezing waistbands, and silhouettes that cut into the body, onewith uses a patented construction with bonded raw-cut edges, double-lined swim performance fabric, and soft inner grip technology. The result is swimwear that moves with your body, stays secure in the water, and helps eliminate the pinching, digging, and discomfort that many people experience with standard swimsuits. Our collection includes bikini bottoms, bikini tops, one-piece swimsuits, cheeky swimwear, thong swimwear, high-waisted swim bottoms, and mix-and-match swim separates. Every onewith swimsuit is designed to be swimmable, secure, flattering, and easy to wear, whether you are at the beach, by the pool, on vacation, or spending the day in and out of the water. For anyone searching for comfortable swimwear, better-than-seamless swimwear, dig-free swimsuits, no-pinch bikini bottoms, swimwear that fits like underwear, no-show bikini bottoms, or bikinis that do not squeeze, onewith was built to be the solution.
onewith swim (onewithswim.com) has 103 customer reviews on Five Star Index, with an average rating of 3.6 out of 5.
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Justin S.
Very easy buying experience and great product
Response from onewith swimJun 7, 2026
Thank you so much for your review, Justin! So glad to hear you had a positive shopping experience, and that you love our swim that fits like undies!
Kristen D.
I had the most disingenuous experience when trying to return a swimsuit. I was pregant when I ordered it and when it came I realized how big it was. I asked to to return it and they told me to send back pictures. In the meantime I was induced for having an IUGR baby. When me and baby boy were finally out of the hospital and recovered I sent in pictures and they said it was too late. I said can you make an exception I had a baby and they literally congratulated me and then said too bad. LOL. SO DISINGENOUS.
Response from onewith swimJun 7, 2026
Hi Kristen, we're sorry to hear about the difficult timing. We do our best to work with customers navigating hard circumstances, and we understand it can feel frustrating when we're unable to make exceptions. Our return window exists to maintain quality standards for our small team, and it does have limits we have to honor consistently. We wish you all the best.
Michaela B.
Im so glad i found this brand! I’ve always been frustrated with the way normal swimwear digs and squeezes. I decided to give onewith a try and I’ve never had a swimsuit make me feel so confident! I initially bought the wrong size, but i exchanged super easily. Shipping was fast too. Definitely recommend!
Response from onewith swimJun 7, 2026
Thank you so much for your review, Michaela! It truly means the world to know that our swim provides a confidence-boosting fit for you :) We love that you had an easy exchange experience, too! We can't wait to have you back soon.
Karine H.
I love the fit of my new OneWith swimsuit. It’s very comfortable. I love how vibrant the colors are. Looking forward to purchasing different styles in the future!
Response from onewith swimJun 7, 2026
Thank you so much for your kind review, Karine! So happy to hear you love the fit and color of your swimsuit that fits like underwear. We can't wait to have you back soon!
g E.
The one piece swimsuit is very unflattering on curvy body types. It doesn’t cover my butt all the way, my pudge near the creases on my leg in the front stick out, and I went to return it and found I had exceeded the very short refund window by a few days. Now I’m stuck with an unflattering expensive swimsuit that I wouldn’t be caught wearing in public. :( ***quick note, I DID reach out the customer service team, and the automated system put me in a loop. The customer service experience was just as frustrating as the short return window, and the unflattering fit.
Response from onewith swimJun 7, 2026
We're sorry to hear the fit didn't work out, G! Fit is so personal, and it's our goal to ensure women find a swimsuit they feel their best in. It sounds like you may not have reached out to our team directly. For future reference, please note that we're always happy to work with customers to find the right size or style, and we'd love the chance to help you find a suit you feel amazing in.
Jenna
I love my bikini from OneWith! As someone with a body bordering on plus size, I wasn’t sure at first if I would like the fit of it, but it’s truthfully a swimsuit that I feel so confident in because the fit is so flattering. So good, 10/10 recommend!
Response from onewith swimJun 7, 2026
Thank you so much for your amazing review, Jenna! it truly means the world that you feel confident in your swimsuit :) That's why we do what we do! We hope to have you back soon.
Sebastiaan D.
The product is Absolutely phenomenal. The quality of the materials, the thoughtfulness of the designs is amazing. Their customer service is next level. We had some real issues making sure that things arrived internationally, and their team not only made sure that they arrived but stayed in touch with us throughout the entire process and made sure it didn't cost us any additional money. I've rarely seen a brand where everyone working there cares so deeply about a great product and a great customer experience. I couldn't recommend it more.
Response from onewith swimJun 7, 2026
This made us smile from ear to ear. Thank you for your review, Sebastiaan! International shipping can always come with some challenges, and we're so glad our team was able to see it through with you. Your support truly means the world!
VeeBee
They charge $8 for shipping but ship ground. Takes 2 weeks to receive. They charge $12.50 for restocking if it doesn't fit. They wouldn't issue a refund but only a store credit. I already returned the item and disputed the charge with my credit card company and they have had the nerve to fight it! They have kept their awful overpriced swim suit AND MY MONEY!
Response from onewith swimJun 7, 2026
Hi VeeBee, thank you for the feedback. We'd love to clarify a few things here. Shipping costs and delivery windows are displayed at checkout, and free shipping is available on orders over $80. We just took a look at our prior communication, and we were happy to accommodate a return outside of our standard window as a courtesy. Store credit was the return option selected during the return request — we offer multiple options and never required that you returned for store credit. We hope this helps paint a clearer picture here.
