A compression shirt that adds a level of protection to make you feel like you can do anything.. . . . . Polyester and elastane blend. HeatGear(R) fabric with compression that is comfortable enough to wear all day. Stretch-mesh underarm panels provide ventilation for breathability. UPF 30+ protection. 4-Way Stretch increases mobility and retains shape. Moisture Transport System wicks moisture for dry comfort. Anti-odor technology fights odor-causing bacteria. Mesh panel on back neck with ARMOUR wordmark. Body: 5.0 oz.. Mesh: 4.6 oz.. Imported.