Super-light HeatGear fabric delivers superior coverage without weighing you down; Mesh underarm & back panels for strategic ventilation; Material wicks sweat & dries really fast; Ergonomic design keeps seams off high abrasion areas & increases durability; Hybrid raglan sleeve construction for added range of motion & comfort; Body: 84% Polyester/16% Elastane; Mesh: 92% Polyester/8% Elastane