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Onewith is an American swimwear brand that sells patented edgeless, elastic-free bathing suits designed to fit like underwear. The brand gained wider recognition after appearing on ABC's Shark Tank and offers sizes from XXS to 3XL.

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At a glance

About onewith

Main category
Swimwear
Size range
XXS to 3XL
Free shipping from
US orders over $80
Exchanges
1 free exchange on eligible orders
Target audience
Women, including midsize, curvy and plus-size shoppers
Technology
Patented edgeless, elastic-free construction
As seen on
ABC's Shark Tank
Onewith positions itself in the swimwear market with a focus on comfort and inclusive sizing, targeting shoppers who have struggled with the dig, pinch, or bulk of conventional swimwear. The brand's core proposition is a patented construction that eliminates exposed elastic and seams at the edges, aimed at midsize, curvy, and plus-size bodies. Pricing sits in the mid-range segment for specialty swimwear, and the product line includes one-pieces, bikini sets, and mix-and-match separates. The brand operates online and ships primarily within the United States, with free shipping available on qualifying orders.
July 2026

Active promotions

Ready to use with your order at onewith.

Free shipping on US orders above a set order value, allowing customers to save on delivery costs when purchasing multiple items.
To the shop
One free exchange on eligible orders, giving shoppers the option to swap for a different size or style if the first choice does not fit as expected.
To the shop
Recent

onewith in the news

Recent updates and background about onewith, summarised in our own words.

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Full swimwear collection now available in XXS to 3XL

Onewith offers its complete range of patented edgeless, dig-free bathing suits across all sizes on its website. The collection includes one-pieces and separates described as going beyond seamless construction.

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Bikini quiz helps shoppers find the right bottom fit

Onewith has a dedicated bikini quiz on its website to help customers identify the best-fitting bikini bottom for their body. The tool is part of the brand's broader fit-first approach to swimwear shopping.

onewith

The story behind the onewith brand

Onewith shares the background of how the brand came to develop its patented swimwear concept on its about page. The page outlines the philosophy that led to creating swimwear designed to feel as comfortable as everyday underwear.

Summaries by Image Review based on publicly available sources and our own editing. External links may contain affiliate links.

Frequently asked questions

What others ask about onewith

Answers to the most common questions, based on search behaviour and our own research.

Is onewith a reliable swimwear shop?

Onewith is a US-based brand with a patented product line that has been featured on ABC's Shark Tank, which provides a degree of public verification. The brand offers a free exchange policy on eligible orders, which gives buyers some recourse if the fit is not right.

Does onewith offer free shipping?

Yes, onewith offers free shipping on US orders over $80. Orders below that threshold may incur standard shipping costs.

Can I return or exchange a swimsuit from onewith?

Onewith offers one free exchange on eligible orders. Customers should check the specific terms on the website to confirm which products qualify.

What sizes does onewith carry?

Onewith carries sizes from XXS through 3XL, making it a size-inclusive option for a wide range of body types.

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