Under Armour Men's Alter Ego Man Of Steel Compression Shirt HeatGear&#174; fabric, with all the benefits of UA Compression, comfortable enough to be worn all day 4-way stretch fabrication allows greater mobility in any direction Moisture Transport System wicks sweat away from the body Anti-Odor technology prevents the growth of odor causing microbes UPF 30+ protects your skin from the sun&#39;s harmful rays