HeatGear® Armour is our original men's hot weather compression shirt—the layer you put on first and take off last. It's tight to wick away sweat and quick-drying to keep you cool. No athlete can go without it. 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 construction moves better in every direction. Material wicks sweat & dries really fast. Anti-odor technology prevents the growth of odor-causing microbes. Mesh panel on back neck with ARMOUR wordmark. Body: 4.7 oz. 90% Polyester/10% Elastane. Mesh: 3.5 oz. 88% Polyester/12% Elastane.