This Contour Underwire Sports Bra features breathable spacer fabric cups, simplex fabric framing, and convertible cushioned straps for support and comfort. Made from Cups - 90% Polyester/10% Spandex; Back - 80% Nylon/20% Spandex; Back Lining - 68% Nylon/32% Spandex; Cup Sling - 100% Polyester, it minimizes bounce for optimal performance.