Shark Tank Swimsuits Like Underwear – onewith

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1 Free Exchange on Eligible Orders

Get 20% off a bikini top + bottom with code BIKINITURNS80

Three pastel pink bubbles with sparkles and subtle iridescent highlights

Three pastel pink bubbles with sparkles and subtle iridescent highlights

Shark Tank studio set with five seated judges left; Hayley Segar at right with three models in black swimwear beside 'oneWith' screen.

our shark tank journey

our viral swimsuits made a splash on Shark Tank, Season 16 Episode 9 — and we scored a deal with two Sharks! watch on ABC.com or Hulu.

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the magic of wearing onewith

see it on, IRL

Size: M

Woman in straw hat and mauve swimsuit sitting at the pool edge reading a book, towel and snacks beside her. — Size: S + M

Size: 2XL

Woman in a black bikini sitting on a sandy beach, leaning on one arm and looking down. — Size: S + M

Front view of blue onewith two-piece swimsuit on plus-size model with knot-front top and raw-cut bottoms at indoor pool — Size: L

1 FREE exchange on eligible US orders

size inclusive (XXS-3XL)

patented, US Patent No. 12,357,039

Three pastel pink bubbles with sparkles and subtle iridescent highlights

hi! i'm hayley, founder of onewith.

we’re so happy you discovered our swim that fits like undies on Shark Tank; welcome to whole new kind of swimsuit that is better-than-seamless, and truly onewith your body. thanks for supporting my female-founded & led small business!

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5.0/ 5 50k+ women who have gone edgeless

What people are saying

Plus-size woman wearing a black bikini — These are exactly what I’ve been looking for my whole life. I love the way I look in seamless underwear and always felt like I looked smushed in a regular swim bottom. This fits PERFECTLY

Jillian M.

Verified Buyer

Back view of blue onewith swim bottom in blue on model showing raw-cut, no-show seamless fit on white background | alexhakim16 / M — Was very skeptical on the fit, but these truly do feel like your no show underwear!

Maritza R.

Verified Buyer

Woman seen from behind in black bikini top and high-cut underwear, curly hair, arms raised. — I probably have close to 100 bathing suits and NONE have the fit that these do!! They fit like they were custom-made and don’t need adjusting every time I get out of the water!

Amanda F.

Verified Buyer

Side view of onewith black seamless bikini set showcasing raw-cut, no-show undie fit on white background | alexhakim16 / S — My soft bits don’t spill. I’m comfortable and I look great. Exactly like my best of pair of underwear! It’s amazing

Janet R.

Verified Buyer

Front view of black high-rise bikini bottoms in black showcasing raw-cut edgeless design with inner grip strip on plus-size model | ariellamayamendes / XL — I’m obsessed, genuinely the best fitting bathing suit bottoms I’ve ever owned. Highly HIGHLY recommend! I am 5’4 ,145lbs and I got a size medium :)

Kylie B.

Verified Buyer

Three women sitting on a seawall facing the water, wearing blue and black swimsuits, showing diverse body types.

“we changed swimwear so that

women don't feel the need to

change themselves.”

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Shop Tops

back shot of model wearing onewith's woodmont bikini bottom in cove — Shop Bottoms

model wearing Bellows Plunge High-Cut One Piece in cherrydip — Shop One Pieces

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Woman in blue bikini standing on porch holding sign reading "follow us @onewithswim" — @onewithswim

Front view of onewith black two-piece swimsuit showing knot-front top and high-rise bottom on a curvy model — @itsmisslys

Woman reclining on rocky shore in a black bikini, wearing layered gold necklaces and rings, hand on chest. — @ahmeimae

Three-quarter view of Hampton bottom in black on a model showcasing high-rise, full-coverage fit with raw-cut edges at poolside — @traceydoes_

Woman in a brown swimsuit top wearing a necklace and an orange hibiscus in her hair, smiling beside a potted hibiscus. — @ivana_ferro