Under Armour Men's HeatGear Armour Mid Compression Shorts 56% Nylon/40% Polyester/4% Elastane Imported Tough, lightweight HeatGear fabric, with all the performance benefits of UA Compression Stretch-mesh gusset & inseam panels deliver strategic ventilation Updated ergonomic design keeps seams off high abrasion areas & increases durability 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast