onia Balconette Underwire Bikini Top in Black. - size M (also in S, XS) onia Balconette Underwire Bikini Top in Black. - size M (also in S, XS) Self: 80% nylon 20% spandex Lining: 84% nylon 16% spandex. Made in China. Hand wash. Underwire cups. Back S-hook closure. Adjustable shoulder straps. Item not sold as a set. ONIR-WX379. WST43-01. Carl Cunow and Nathan Romano co-founded onia in 2009, a lifestyle brand inspired by modern voyagers. From swimsuits to loungewear, overnight bags to beach blankets, the range is created with versatility in mind - seamlessly transitioning from the daily routine to faraway retreats, and with the ability to beautifully withstand the rigors of traveling. onia, which means 'sailboat' in Hebrew, represents Carl and Nathan's shared passion for adventure - whether on the sea or off the beaten path - journeys of discovery and fine craftsmanship, rooted in superior design.