Imagine packing for a long-awaited beach vacation, only to realize that every swimsuit you own is either too tight, digs into your skin, or simply doesn’t fit right. For years, women have struggled with swimwear that prioritizes fashion over comfort, forcing them to choose between style and feeling at ease.
That frustration is exactly what led Hayley Segar to create Onewith, a revolutionary swimwear brand that feels as seamless and comfortable as your favorite underwear. Now, women can enjoy the sun, sand, and water without dealing with uncomfortable swimwear.
With years of experience in fashion and social media, Hayley knew that traditional swimsuits focused more on looks than comfort. Inspired by seamless underwear, she developed a line of swimwear designed to fit like a second skin.
Her innovative approach not only solved a long-standing problem but also caught the attention of Shark Tank investors.
With a strong online presence, a rapidly growing customer base, and a fresh deal from two powerhouse Sharks, Onewith is on its way to redefining the swimwear industry.
Onewith’s Journey Before Shark Tank
Hayley’s idea for Onewith was born in 2019 while she was packing for a Miami trip. She realized she couldn’t find a swimsuit that felt as comfortable as her favorite underwear.
With a background in social media marketing and brand development, she saw an opportunity to create a seamless, dig-free swimwear line that fit like a second skin.
Instead of settling for uncomfortable options, she decided to create her own. “I knew instantly that it was going to succeed. It hit me like a freight train,” she said.
After years of research and testing, she launched Onewith in late 2021. The brand offers patent-pending swimsuits with a seamless, dig-free, and elastic-free design that lays flat against the skin.
“Our swimsuits lay flat on the skin, eliminating tight seams and compressing elastic, making them feel truly ‘one with’ your body,” Hayley explained.
The brand’s patent-pending swimsuits feature:
- Seamless, dig-free, elastic-free design
- Underwear-like comfort
- Size-inclusive and ultra-flattering silhouettes
She started the company with $130,000 of her own savings from her work as a beauty content creator. To grow the business, she joined the 2020 Summer Fellowship Accelerator at the Connecticut Center for Entrepreneurship & Innovation.
Through this program, she earned $15,000 in non-dilutive funding. Her efforts paid off, by 2024, Onewith had sold over 50,000 units and built an engaged social media audience of 60,000 people.
“I don’t know where I’d be without the support of my mentors and the accelerator program. It solidified my belief in myself,” she said.
The Shark Tank Pitch
When Hayley walked into the Shark Tank, she confidently asked for $200,000 in exchange for 5% equity, valuing Onewith at $4 million. She passionately explained how her swimwear solved common issues women faced with traditional bikinis and one-pieces.The Sharks were immediately interested.
She shared impressive sales numbers. Onewith had generated $2.3 million in revenue since launching in late 2021, with $1.3 million in sales in 2024 alone. The Sharks were particularly impressed with her profit margins:
- Bikini tops and bottoms cost $12 to make but sell for $49 and $47. This gave a 75% profit margin.
- One-piece swimsuits cost $23 to manufacture and sell for $89.
- Customer acquisition cost: $15 per customer.
- Return rate: 11%, well below the industry average of 15%-30%.
Kevin O’Leary, known for his sharp critiques, praised her pitch. He said, “Very impressive presentation. I usually find something to rip you to pieces on, but not here. You did a great job.” However, despite his admiration, he chose not to invest. Mark Cuban also passed on the opportunity.
Barbara Corcoran, who had invested in swimwear brands before, expressed concerns about retail distribution. She explained that one of her past investments, Raising Wild, struggled in retail despite performing well online.
Instead, she offered $200,000 for 20% equity, but with a condition, Onewith had to remain a direct-to-consumer brand. Guest Shark Jamie Kern Lima, the founder of IT Cosmetics, agreed with Barbara’s strategy and decided to partner with her.
Hayley tried to negotiate for 12% equity. But ultimately, she accepted their 20% offer, securing two powerhouse investors who would help take Onewith to the next level.
Onewith Shark Tank Update
Right after the Shark Tank episode aired, Onewith’s website traffic exploded. More than 20,000 visitors were on the site at once. Sales skyrocketed as new customers rushed to buy the swimsuits.
The brand also gained major media attention, with features in People and InStyle magazines. This added to its credibility and reach. Hayley celebrated the milestone with a party attended by over 100 friends, family, and business mentors.
Reflecting on her success, she shared, “It feels crazy to have this out in the open now after keeping it in my mind and heart for so long.”
With the support of Barbara Corcoran and Jamie Kern Lima, Onewith is now in a strong position to expand. “Having two powerful strategic advisers will allow me to reach a new audience and grow my business in exciting ways,” Hayley said.
What’s Next for Onewith?
With two experienced investors backing the company, Hayley is focused on scaling Onewith strategically.

She plans to:
- Expand the product line with more styles and sizes.
- Boost marketing efforts through influencer partnerships and social media campaigns.
- Keep the brand direct-to-consumer, ensuring strong profit margins.
- Capitalize on peak swimwear season with special promotions and sales.
Hayley envisions Onewith becoming a widely recognized name in the fashion industry. She hopes it will be known much like Spanx revolutionized shapewear.
“I can’t wait for Onewith to be recognized universally as a solution … much in the way that Spanx is recognized for smoothing and shaping.”
Hayley Segar
Final Thoughts
Hayley Segar’s journey from a frustrated shopper to a Shark Tank-backed entrepreneur is truly inspiring. Onewith is more than just swimwear. It’s about empowering women to feel confident and comfortable.
With a strong business foundation, a growing customer base, and the support of two powerful investors, the brand is set for major success.
The question remains, will Onewith become the next big name in swimwear? If its rapid growth is any indication, the answer is a resounding yes!
We’re closely following the company to bring you valuable insights. Stay tuned for the latest updates on Onewith!
Feature Image Credit: @abc/@christopherwillard