Oakley Women's Optic Fiber Solid Pacific Coast Halter Bikini Top Shell: 72% Nylon, 28% Spandex/ Lining: 95% Polyester, 5% Spandex Ties at back and neck for customized fit. Removable bra cups. Sand resistant lining. Oakley branded trim with rubberized finish. 45% Polyester, 44% Nylon, 11% Spandex.