Under Armour Mens Speedform Apollo Running Shoes Gravel Grey Synthetic Innovative UA SpeedForm technology delivers zero distraction while running Seamless heel cup with silicone grip for a locked-in, anatomical fit Smooth, ultrasonic welded seaming with Bemis tape for next-to-skin support & comfort Perforated upper with ultrasonic seal for durable breathability Molded 4D Foam footbed conforms to your foot's exact shape, eliminating slippage