The Natori Sports Bra provides superior support and comfort. Sports bra with Underwire. Double ply seamless cups add support and comfort. Cups contain bust. No uncomfortable rubbing. Reinforced side cup support. Non-stretch fabric comfort straps. Plush covered wire casing and back closure. Fabric covered wire band comfortable holds in place. Fabric covered elastic around arm add no pinching. Back adjustable 4 loop straps. Body: 55 Cotton, 35 Polyester, 10 Spandex. Lining: 100 Nylon.