Under Armour HeatGear Coreshort Running Shorts X Band - Mimics your body and core to strategically stabilize and boost muscle performance in key areas. Moisture Transport System - Wicks sweat to keep you dry and light. Anti-odour Technology - Keeps your gear fresher for longer. 4-way Stretch Fabrication - Allows greater mobility in any direction. Flatock Seams - Eliminates chafing and consequent irritation.