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. Glass Fiber Infused Nylon MIZUNO WAVE® Plate: Super responsive with increased flexibility for a gentler ride with medial and lateral support. 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. Engineered Mesh Upper: Both breathable and durable for high performance. Internal Support Strap: Securely holds mid-foot area. Lightweight Heel Counter Triple Shoelace Loop: Keeps tongue in correct position while running. Rubber Outsole: Designed for a softer landing. Eco Friendly Materials: Recycled materials MIZUNO ENERZY XP: Fusion of high level softness, response, and light weight for unbelievable performance. MIZUNO ENERZY NXT: The next generation of MIZUNO ENERZY midsole material. Designed to maximize energy return and cushioning for optimum performance.