MIZUNO ENERZY - An all new foam that is more responsive and has more springy qualities compared to former Running EVA technologies - U4ic and U4icX. U4icX Midsole - A lighter, more cushioned iteration of U4ic, delivering a softer underfoot feeling for a smooth transition. U4icX Strobel Lasting Board - Ensures a comfortable underfoot feel. X10 Outsole - Durable carbon rubber that allows for longer wear. Foam Support Wave - A Wave of comfort and support made of foam. Jacquard Mesh Upper. Weight - 9.7oz. Drop - 10mm.