This shoe is perfect for runners who like to incorporate speedy sprints into their runs, whether or not they are training for competitions and to set new records. The shoe is packed with features that support speed running with the correct gait, including the SMOOTH SPEED ASSIST. The MIZUNO ENERZY LITE material offers enhanced softness at a light weight for the top midsole, while the MIZUNO ENERZY FOAM at the bottom midsole provides cushioning and energy return.