Under armour heatgear armour ls topthis mens heatgear armour top is a long sleeve compression top designed with state of the art fabrics and panelling to deliver compression without sacrificing breathability the 4 way stretch fabrication allows greater mobility in any direction made from heatgear fabric this compression top is comfortable enough to be worn all day and has stretch mesh underarm panels so your body can regulate its own temperature the compression top has also been treated with