Mizuno Enerzy Nxt material across the entire sole for amazing cushioning and energy return. The cushioning and energy output have been significantly improved from the previous model. 2) The Smooth Speed Assist design supports a smooth and efficient running form. 3) The Vibram Megagrip outsole delivers excellent grip and traction, even on wet surfaces. 4) The Rock Plate in the forefoot cushions impact from stones and rocks on trails for comfortable runs. â– Upper 5) Durable woven mesh construction. 6) The waterproof upper made with Gore-Tex keeps you comfortable and protected in any condition, supporting safe trail running.