This Under Armour long sleeve shirt is perfect for men who work out at the gym or support health - related causes. You can wear it alone on a casual workout day or under a uniform for more formal fitness events. It has a slim fit. The Super - light HeatGear fabric doesn't weigh you down, and there are mesh panels in the underarm and back for ventilation. The material wicks sweat fast and has anti - odor technology. Machine wash it cold with like colors and tumble dry on low.