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. Foam Wave: A Wave of comfort made of 2 layers of foam. Top layer is U4icX and bottom layer Mizuno Enerzy Foam Wave: A Wave of comfort made of 2 layers of foam. Top layer is U4icX and bottom layer Mizuno Enerzy Smooth Stretch Woven: Designed to control stretching direction for running motion and performance. Smooth Stretch Woven adapts to your foot and keeps your foot position correct. Gusseted Tongue: Stretchy tongue lining that hugs the foot securely and comfortably without any stress. X10 Outsole: Durable carbon rubber that allows for longer wear. Eco Friendly Materials: Recycled materials