Additional 2mm of cushion and MIZUNO ENERZY Foam, while the asymmetrical foam wave and rubber wall supply even greater stability than before. MIZUNO ENERZY CORE - New advanced midsole material, delivering the most resiliency and softness. It improves comfort and adds spring to drive optimum performance. A Wave of comfort made of 2 layers of foam. Top layer is U4icX and bottom layer Mizuno Enerzy. Smooth Stretch Woven. Stretchy tongue lining that hugs the foot securely and comfortably without any stress. Durable carbon rubber that allows for longer wear. Recycled materials. Drop - 8mm. Stack Height - Forefoot 33mm / Heel 41mm.