For trail runners of average to slightly heavy weight. For trail runners who run in harsh environments such as on rocks rather than gravel roads. For long distance trail runners. This shoe is fully loaded with Mizuno's signature features to keep you comfortable on even the harshest terrain. The shoes are fully equipped with MIZUNO ENERZY and MIZUNO WAVE Foam from heel to toe, providing excellent cushioning, energy return, and stability. Support panels on the sides of the midfoot also keep the foot securely in place even on tough trails.