Foam Wave: A Wave of comfort made of 2 layers of foam. Top layer is U4icX and bottom layer Mizuno EnerzyFoam Wave: A Wave of comfort made of 2 layers of foam. Top layer is U4icX and bottom layer Mizuno EnerzyMIZUNO ENERZY NXT: The next generation of MIZUNO ENERZY midsole material. Designed to maximize energy return and cushioning for optimum performance.X10 Outsole: Durable carbon rubber that allows for longer wear.Eco Friendly Materials: Recycled materials