Reaching beyond is no obstacle when you're floating in the Wave Sky 8. Foam Wave: A Wave of comfort made of 2 layers of foam.  Top layer is U4icX and bottom layer Mizuno Enerzy Eco Friendly Materials: Recycled materials MIZUNO 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. Gusseted Tongue: Stretchy tongue lining that hugs the foot securely and comfortably without any stress. MIZUNO ENERZY (FOAM): Offering versatility in its application, while still maintaining softness and resilience.  It will help enhance performance capabilities.