Under Armour Men`s Alter Ego Thor Compression Shirt HeatGear 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 & dries fast. Anti-odor technology prevents the growth of odor causing microbes. UPF 30+ protects your skin from the sun's harmful rays. Smooth, chafe-free flatlock seam construction. Polyester/elastane.