Under Armour HeatGear Armour Printed Long Sleeve Compression Top - Small - Grey HeatGear - Lightweight fabric construction that draws moisture away from the skin and dries rapidly. Power Mesh Insets - Increases the ventilation offered by the garment. 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. Anti-Microbial Technology - Keeps the kit feeling and smelling fresher for longer.