Under Armour Boys Alter Ego Marvel Fitted Baselayer Top 84% Polyester/16% Elastane Imported HeatGear fabric is ultra-soft & smooth for extreme comfort with very little weight 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes UPF 30+ protects your skin from the sun's harmful rays