Stay cool and dry while you workout in the Under Armour Men's HeatGear Armour Mock Sleeveless Top. This top is made from 84% polyester and 16% elastane HeatGear® fabric for lightweight coverage. The anti-odor technology prevents the growth of odor-causing microbes for all-day freshness, while the mesh underarm and back panels allow for strategic ventilation. Under Armour Men's HeatGear Armour Mock Sleeveless Top Black, X-Large - Men's Athletic Performance Tops at Academy Sports