This shoe is optimized for runners who want an effortless running feel as they strive to improve their performance in races. VIBRAM® MEGAGRIP OUTSOLE: VIBRAM®'s leading high performance compound. It provides outstanding grip, especially on wet and uneven terrain. 30% more vertical grip and 20% more lateral grip than conventional VIBRAM® soles. MIZUNO ENERZY NXT: The next generation of MIZUNO ENERZY midsole material. Designed to maximize energy return and cushioning for optimum performance. Rock Plate: Designed to protect your foot from sharp objects, rocks or roots while you are on the trail. Eco Friendly Materials: Recycled materials 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. Gusseted Tongue: Stretchy tongue lining that hugs the foot securely and comfortably without any stress.