Under Armour HeatGear ArmourVent Compression Leggings - SS15 HeatGear - Lightweight fabric construction that draws moisture away from the skin and dries rapidly. ArmourVent Mesh Panels - Deliver true breathability in a light, stretchy, durable, fast-drying fabric. Moisture Transport System - Draws moisture away from the skin in to the 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.