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Free Shipping on US Orders Over $80

1 Free Exchange on Eligible Orders

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

5.0/ 5 over 50,000 happy customers

Bikinis = 20% Off

The bikini debuted 80 years ago, and we're celebrating with 20% off!

Add a bikini top and bottom to your cart + use code BIKINITURNS80 through 7/5.

Save 20%

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

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 pastel pink bubbles with sparkles and subtle iridescent highlights

Three pastel pink bubbles with sparkles and subtle iridescent highlights

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.

Two models standing together in onewith swimwear

Three pastel pink bubbles with sparkles and subtle iridescent highlights

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

Shop all

image of onewith's founder Hayley on Shark Tank

Three pastel pink bubbles with sparkles and subtle iridescent highlights

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

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

Woman in a black onewith bikini posing by a pool — @traceydoes_

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