Eco Friendly Materials: Recycled materials MIZUNO WAVE: The MIZUNO WAVE plate disperses energy from impact to a broader area providing a stable platform and a superior cushioning. Gusseted Tongue: Stretchy tongue lining that hugs the foot securely and comfortably without any stress. X10 Outsole: Durable carbon rubber that allows for longer wear. MIZUNO ENERZY NXT: The next generation of MIZUNO ENERZY midsole material. Designed to maximize energy return and cushioning for optimum performance.