MIZUNO ENERZY (FOAM): Offering versatility in its application, while still maintaining softness and resilience. Foam Wave: A Wave of comfort made of 2 layers of foam. Top layer is U4icX and bottom layer Mizuno Enerzy U4icX Midsole: A lighter, more cushioned iteration of U4ic, delivering a softer underfoot feeling for a smooth transition. AIRmesh Upper: AirMesh Upper for superior feel, breathability, and comfort.