The lightweight HeatGear® fabric provides excellent coverage without adding weight. Mesh inserts under the arms and on the back for strategic ventilation. The material wicks away sweat and dries very quickly. Ergonomic design with seams outside high-wear areas for increased durability. Hybrid raglan sleeve design for greater freedom of movement and comfortExtremely lightweight HeatGear® fabric provides excellent coverage without adding weightMesh panels under arms and on back for strategic ventilation