The Mizuno Wave Inspire 13 is focused on providing runners with cushioned stability in a new, lighter and more flexible package. The support system in this shoe is there for the long haul, taking runners where they want to go, comfortably. As always, the Wave Inspire is built for the runner in need of stability and guidance. Upper: AIRmesh™ provides optimum breathability and comfort. Lace-up front offers an adjustable fit. Padded tongue and softer heel collar further enhance comfort.Midsole: U4ic compound in the top midsole ensures lighter weight, durable, and more cushioned resiliency. Double Fan Wave provides motion control. U4icX heel wedge for a softer feel. Removable insole.Outsole: SmoothRide Engineering™ creates a smooth, rocking-chair-like transition from heel to toe. X10® durable carbon rubber delivers longer wear in high impact areas and supplements traction at heel strike.