Under Armour HeatGear Armour Printed Compression Shirt - SS15 - Large - Blue HeatGear - Lightweight fabric construction that draws moisture away from the skin and dries rapidly. Compression Fit - Assists with increasing oxygen supply to the muscles, delaying muscle fatigue and reducing vibration feedback Moisture Transport System - Draws moisture away from the skin in to the mid/outer layer to be evaporated. 4-way Stretch Construction - Affords an increased range of motion. Stretch-Mesh Underarm Panels - Deliver strategic ventilation.