For when runners want to go as fast in training as they do on race day, that's where the Mizuno Sayonara 4 takes over. This ultra-lightweight yet responsive running shoe will allow for top notch speed any day of the week. Take these along to the track or out on the road for race day and enjoy the ride! Upper: 3D Mizuno fit helps maintain a high standard of breathability and comfort. Padded tongue and heel collar enhance comfort. Flat laces reduce irritation.Midsole: Parallel Wave and U4ic midsole compound provides high comfort and performance, while being extremely lightweight. Mizuno Wave Technology provides both cushioning and stability. Removable insole.Outsole: Improved blown rubber allows for a softer landing, longer wear in high impact areas, and provides more traction.