Under armour heatgear armour short sleeve topthe under armour heatgear armour short sleeve top is made from heatgear fabric making it comfortable enough to be worn all day while featuring all the benefits of ua compression featuresmaterial body 84 polyester 16 elastane mesh 92 polyester 8 elastane stretch mesh underarm panels deliver strategic ventilationupf 30 protects your skin from the suns harmful rays4 way stretch fabrication allows greater mobility in any directionmoisture