The Nike Pro Combat Hyperwarm Fitted Mock is designed to keep you warm, even when it's not. It uses a brushed polyester Dri-FITŪ technical fabric for maximum warmth and to help keep you dry. Fitted construction provides support and helps keep you warm. Mock-neck construction and sleeve cuffs help retain heat. Flatseam construction helps reduce chafing, and ergonomic seams were designed for movement. 88% polyester/12% spandex. Imported.