Nike Pro Combat Core Thermal Mock - Boys' Grade SchoolThe Nike Pro Combat Core Thermal Mock is designed to keep you warm, even when it's not. Dri-FITŪ technical fabric provides maximum warmth and helps keep you dry. Compression fit offers support and helps keep you warm. Mock neck construction and sleeve cuffs help retain heat. Flat seam construction helps reduce chafing. Ergonomic seams were designed for movement. Dri-FITŪ 88% polyester/12% spandex. Imported.