For training or game day, the Nike Pro Cool Boy's Fitted HBR Top fits comfortably with ergonomic seams and mesh panels for enhanced ventilation.Nike’s Dri-FIT fabric keeps you cool and dry, drawing moisture away from the skin.Fabric: 92% Polyester / 8% SpandexDri-FIT fabric helps keep you dry and comfortable, drawing sweat away from the skinMesh panels on the back enhance breathabilityFlat seams for reduced risk of irritationErgonomic seams for a natural range of motion