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onewith swim

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onewith swim

As Seen on Shark Tank: Swimsuits That Fit Like Underwear®️ | We Changed Swimwear So Women Don’t Feel the Need to Change Themselves

Overview

Date Established 11/2021
Founder Hayley Segar
Headquarters Darien
Industries
E-commerce & Retail
Fashion
Lifestyle
Website https://onewithswim.com/
Social

About

onewith changed swimwear so that women don't feel the need to change themselves. As seen on Shark Tank, onewith fills a white space in an otherwise saturated industry with patent-pending swimsuits that fit like underwear®, solving the desire women have for a swimsuit that is as flattering as no-show, seamless underwear.


Dig-free, elastic-free, and edgeless, onewith consistently goes viral with their problem-solving product that women adore nationwide. onewith swim is female-founded and size-inclusive, offering XXS-4XL.

Founding Story

A native resident of the Connecticut shoreline & a first-born daughter with a lifelong affinity for clothes, Hayley Segar is a beach-loving problem solver...who always hated swimwear.


"I always loved fashion, but hated swimsuits. I knew there was something wrong with it, but coudn't put my finger on the exact issue. I just sucked it up and wore subpar swimwear that dug and squeezed, year after year."


That was, until April of 2019 when Segar had her lightbulb moment after trying on dozens of swimsuits. "I literally said out loud out of frustration, 'I just want a swimsuit that fits like my favorite no-show underwear does.' And it was in that moment that it hit me. I knew had to create it."


Fast forward to November 2021 when Hayley launched her patent-pending swimsuit concept that is truly 'onewith' a wearer's body. Size-inclusive, edgeless, dig-free, and elastic-free, onewith is everything normal swimwear, as we know it, is not.


Women wanting swimwear that fits like underwear is nothing new; onewith is simply the brand that brought it to life, filling a white space in an otherwise saturated industry. onewith consistently goes viral for this reason.


Hayley is a graduate of the University of Connecticut. She is a self-described "cat-person convert," and resides in CT with her three beloved rescued cats.

Products

Bellows Plunge High-Cut One Piece
Bellows Plunge High-Cut One Piece $89.00
Compo Hipster Bikini Bottom
Compo Hipster Bikini Bottom $49.00
Foxon Multi-Way Bandeau Bikini Top
Foxon Multi-Way Bandeau Bikini Top $49.00
Compo Hipster Bikini Bottom
Compo Hipster Bikini Bottom $47.00
Hampton High Waisted Bikini Bottom
Hampton High Waisted Bikini Bottom $47.00
Huntington Thong Bikini Bottom
Huntington Thong Bikini Bottom $47.00
Merritt Dipped Cheeky Bikini Bottom
Merritt Dipped Cheeky Bikini Bottom $47.00
Bellows Plunge High-Cut One Piece
Bellows Plunge High-Cut One Piece $89.00
Thames Scoop Neck Bikini Top
Thames Scoop Neck Bikini Top $49.00
Harkness Strapless Bandeau Bikini Top
Harkness Strapless Bandeau Bikini Top $49.00
Westerly Tie-Front Bikini Top
Westerly Tie-Front Bikini Top $49.00
Penfield High Waist Thong Bikini Bottom
Penfield High Waist Thong Bikini Bottom $47.00
Woodmont Cheeky Bikini Bottom
Woodmont Cheeky Bikini Bottom $47.00
Roxbury Plunge Neck Bikini Top
Roxbury Plunge Neck Bikini Top $49.00
Bellows Plunge High-Cut One Piece (Cherrydip)
Bellows Plunge High-Cut One Piece (Cherrydip) $89.00

Team Bios

Hayley Segar Headshot.jpg

Hayley Segar

Founder

see bio

A native resident of the Connecticut shoreline & a first-born daughter with a lifelong affinity for clothes, Hayley Segar is a beach-loving problem solver...who always hated swimwear.


"I always loved fashion, but hated swimsuits. I knew there was something wrong with it, but coudn't put my finger on the exact issue. I just sucked it up and wore subpar swimwear that dug and squeezed, year after year."


That was, until April of 2019 when Segar had her lightbulb moment after trying on dozens of swimsuits. "I literally said out loud out of frustration, 'I just want a swimsuit that fits like my favorite no-show underwear does.' And it was in that moment that it hit me. I knew had to create it."


Fast forward to November 2021 when Hayley launched her patent-pending swimsuit concept that is truly 'onewith' a wearer's body. Size-inclusive, edgeless, dig-free, and elastic-free, onewith is everything normal swimwear, as we know it, is not.


Women wanting swimwear that fits like underwear is nothing new; onewith is simply the brand that brought it to life, filling a white space in an otherwise saturated industry. onewith consistently goes viral for this reason.


Hayley is a graduate of the University of Connecticut. She is a self-described "cat-person convert," and resides in CT with her three beloved rescued cats.

Affiliates

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Press

OK! Magazine - Apr 25, 2025 Hayley Segar Wants to Make Her onewith Customers Feel 'Confident' in Their Bathing Suits: 'The Most Fulfilling Thing I've Ever Done' "Hayley Segar came up with the idea for onewith in 2019, when she had a "one-track mind" about bringing the brand to life."
Vacationer Magazine - Apr 03, 2025 Best Beach Finds for Summer Fun "As the weather gets warmer, our minds turn to getting the right gear together for a trip to the beach. Here are some fab finds."
TrendHunter - Mar 08, 2025 Reality Star-Approved Swimwear Lines "The collaboration between Bachelor Nation’s Mari Pepin and onewith swim introduces a limited-edition swimwear collection that blends personal storytelling with innovative design. Known for its patent-pending, second-skin swimwear that fits seamlessly like underwear, onewith has partnered with Mari Pepin to create a capsule collection featuring three of the brand’s popular silhouettes in two unique colorways. Each design is said to reflect Mari’s personal journey, cultural heritage, and vibrant personality. The Mariposa Pop print, for instance, incorporates tropical flowers, Taíno symbols, and butterflies to symbolize her Hawaiian upbringing, Puerto Rican roots, and lively spirit. Meanwhile, the Lucky colorway, inspired by her trip to Ireland, radiates positivity and abundance in a rich kelly green hue."
Her Campus - Aug 07, 2024 Onewith Swimwear’s Hayley Segar Credits Her College For Her Business Success
Forbes - Jul 11, 2024 The 22 Best Bathing Suit Brands, Tested By Our Editors

Press Releases

Partnerships - Feb 14, 2025 onewith swim Featured on Shark Tank
Partnerships - Feb 14, 2025 Bachelor Nation’s Mari Pepin and Shark Tank Alum onewith swim Unveil Limited-Edition Swim Collection
All Press Releases

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