Under Armour Charge RC Running Shoes Revolutionary Two-piece upper - lets foot flex for more natural, efficient feel. UA Compression Fabric - in forefoot gives ultra-secure fit and reduces muscle fatigue, for harder, longer training. UA HeatGear fabric - wicks away sweat to keep feet cool, dry, and light. Super Lightweight - Weighs less than 10 ounces, giving you a lighter feel and making your workout easier. Full-Length Mirco G foam cushions - Thin and Light, not only that, it's highly cushioned as well as featuring bulkier foam, it helps rebounds your heel-strike energy, creating forward momentum.