Iso-Chill fabric helps dissipate body heat, so it's cool to the touch. Mesh panels in the armpits and back for strategic ventilation. The material wicks away sweat and dries very quickly. The ergonomic design protects seams from abrasion and increases durability. Hybrid raglan sleeve construction for greater range of motion and comfort. Shaped hem. Odor control technology minimizes odor. Material: 77% Nylon, 23% Elastane