Bali Women's One U Back Smoothing Wirefree Bra Cup, Back: 76% Nylon, 24% Spandex Imported Hook and Eye closure Hand Wash Comfort U back design to keeps straps in place and 2 way convertible straps 2 ply back and wing to provide smoothing under clothes Style 3357 Cup, back: 76% nylon/24% spandex; Inner center front: 100% nylon; Cup linings: 100% polyester; Cup pad: 100% polyurethane foam; Center front lining: 75% cotton/25% polyester; Back lining: 71% nylon/29% spandex