Playtex 5222 Stretch Cotton Underwire Cups, cup extension, center: 92% Cotton, 8% Spandex. Back: 95% Cotton, 5% Spandex. Cup extension innerlining, center lining: 100% Nylon. Cup extension lining: 65% Polyester, 35% Cotton. Fiberfill: 100% Polyester. bras closure The cotton lovers favorite underwire  plenty of support, yet with the refreshing feel of a breathable, stretchable cotton blend. Seamless stretch cotton fabric for cool support. Cushioned camisole straps wont dig into shoulders. Soft, subtle trim adds just a hint of feminine detailing.Fiber Content: "Cups, cup extension, center: 92% Cotton, 8% Spandex. Back: 95% Cotton, 5% Spandex. Cup extension innerlining, center lining: 100% Nylon. Cup extension lining: 65% Polyester, 35% Cotton. Fiberfill: 100% Polyester."