87% cotton, 13% spandex jersey; moisture management; medium cotton support with mesh ventilation; power-mesh panel in back for breathability; reflective "C" logo on back band; Oxford is 44% cotton, 44% polyester, 12% LycraŽ spandex; upper back piecing is 84% nylon, 16% LycraŽ power-mesh; inner bra liner is 90% polyester, 10% LycraŽ jersey.