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Free Shipping on US Orders Over $80

1 Free Exchange on Eligible Orders

5.0/ 5 over 50,000 happy customers

swimsuits that fit like underwear^®

Patented, better-than-seamless swimwear that's dig-free, elastic-free, and edgeless...for a second-skin fit that is truly onewith your body.

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Three women holding hands and smiling as they walk on a rocky beach wearing onewith swimwear: blue bikini, black bikini, red one-piece

as seen on

designed to start snug — then soften into a smooth, no-dig, second-skin fit after a stretch

5.0/ 5 50k+ women who have gone edgeless

What people are saying

Front view of Merritt Dipped Cheeky black bikini bottoms and triangle top on a plus-size model, raw-cut second-skin fit — 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 Merritt Dipped Cheeky Bikini Bottom in blue showing raw-cut, no-show underwear fit and cheeky coverage 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

Rear view of Woodmont bikini bottom showcasing high-cut cheeky coverage and seamless black fabric on white background — 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 Kittery Classic Triangle Bikini Top showing raw-cut no-show fit and adjustable neck and back ties | 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 of Jennings V-Cut High-Waisted Bikini Bottom showing V-front, raw-cut edgeless finish and inner grip strip | 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

About us

Hi! we're onewith.

We invented swimwear that fits like no-show underwear.

Our patented swimwear is dig-free, elastic-free, and edgeless, just like your favorite no-show seamless undies! truly onewith a woman's body.

Front view of two women modeling black onewith swim bikinis showcasing edgeless, no-dig fit on a porch with potted flowers

1 FREE exchange on eligible US orders

size inclusive (XXS-3XL)

patented, US Patent No. 12,537,039

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

Three models wearing onewith swim facing away from the camera

“we changed swimwear so that

women don't feel the need to

change themselves.”

Shop by category

model wearing westerly tie front bikini top in jelly — 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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Our Story

As seen on

ABC's Shark Tank!

We took our viral better-than-seamless swimsuits to swim with the Sharks...as seen on Season 16, Episode 9 of ABC's Shark Tank! 🌊 (and yes, we walked away from the Tank with a deal with not one, but TWO Sharks!) Watch on ABC.com or Hulu.

As Seen on Shark Tank

Front view of Foxon Multi-Way Bandeau bikini top in Cove blue on model showcasing smooth, no-dig second-skin fit with porch background; model holds sign reading follow us @onewithswim — @onewithswim

Front view of Foxon Multi-Way Bandeau Bikini Top with matching black high-rise bottoms showcasing knot-front bandeau top and high-rise fit on a model against a plain light wall — @itsmisslys

Reclining view of Foxon Multi-Way Bandeau bikini top in black showing adjustable multi-way straps and seamless, no-dig fit on a model against a rocky shore — @ahmeimae

Three-quarter view of Foxon multi-way bandeau bikini top in black showcasing front knot tie and high-rise bottoms at poolside — @traceydoes_

Three-quarter view of Foxon Multi-Way Bandeau bikini top in Cove brown showing seamless raw-cut fit on model with hibiscus background — @ivana_ferro