Feather light, bullet fast and superb fitting. Extremely lightweight PoWnCe midsole reduces shoe weight without compromising on cushioning. Increased speed for first steps provided by D flex groove under the foot. premium 2 layer cushioned sockliner. Mizuno wave is inspired by nature, a unique midsole technology that provides both cushioning and stability. Wave's unique shape dissipates impact forces away from teh floor for a smooter, more cushioned feel on every step. X10 provides durability and traction, X10 provides extremely durable Mizuno carbon rubber that allows for longer wear in high impact areas and provides more traction at the heel strike. Premium insock, a high grade removable insock for comfort and cushioning.