Comfort, performance, and sustainability come together beautifully to for the Wave Neo Ultra. It's our first time using all three proprietary midsole materials, MIZUNO ENERZY CORE, castor bean oil based MIZUNO ENERZY LITE, and bio based MIZUNO ENERZY (FOAM), together in one performance package, providing a unique feel you have to experience. The Wave Neo Ultra is designed to cushion your run and lessen impact on the environment.