Under Armour Men's UA Speedform Amp Black/Phoenix Fire/Black Athletic Shoe Synthetic Imported Rubber sole UA SpeedForm Technology - Delivers zero distraction while training. UA AMP Technology - Amplifies the biomechanics of your foot's movement for a precision fit, feel and proprioception. External TPU Heel Counter - For locked in support. Molded Toe Cap - For added protection. Silicone Taping - Located on the forefoot for grip and durability during training.