"Hanabi ("fireworks") mark the celebration of Natsu Matsuri (""Summer Festivals"") that take place across Japan as a time to come closer with family and friends. MIZUNO ENERZY NXT: The next generation of MIZUNO ENERZY midsole material. Designed to maximize energy return and cushioning for optimum performance. Knit Upper: Completely knit upper combines a sleek design and a natural fit for all foot types. Eco Friendly Materials: Recycled materials MIZUNO WAVEA(R): The MIZUNO WAVEA(R) plate disperses energy from impact to a broader area providing a stable platform and a superior cushioning. Smooth Speed Assist: Mizuno's signature geometry that is designed for maximum performance. The significant heel bevel encourages an efficient midfoot landing, the midfoot contact point supports the calf and the aggressive forefoot rocker delivers a smooth and propulsive transition.