Compression fit: Ultra-tight, second skin HeatGear® fabric, with all the benefits of UA Compression, comfortable enough to be worn all day Stretch-mesh underarm panels deliver strategic ventilation UPF 30+ protects your skin from the sun's harmful rays 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat away from the body Anti-odour technology prevents the growth of odor-causing microbes Mesh panel on back neck with ARMOUR wordmark Make this the first thing you put on and the last thing you take off - every workout. Offering a ultra-tight, compression fit, with strategic ventilation and a Moisture Transport System that wicks away sweat to help keep you focused on your workout.