Natori Women's Seamless Power Cotton: 69% Cotton, 31% Spandex; Lace: 66% Nylon, 34% Spandex Imported Hook and Eye closure Hand Wash Seamless full fit cotton contour cups give a natural shape that will disappear under clothing Raised sides and ballet back offer extra side support and minimize back bulge Convertible straps can be worn crossed in back for even more support