This shoe supports an effortless running experience in a variety of situations, from daily jogs to speed-boosting training to long runs. While there are other products that offer such an experience through soft midsole materials with high energy return, the Mizuno Neo Zen is equipped with SMOOTH SPEED ASSIST, which functions to support running with a more efficient form, thus supporting an "effortless running experience" at an even higher level.For experienced runners who value running as an important part of their life and own multiple shoes that they wear on rotation1) SMOOTH SPEED ASSIST This daily training model utilizes features developed for racing shoes. It helps achieve efficient running form during regular runs and training. 2) MIZUNO ENERZY NXT (NITROGEN INFUSED VERSION) Mizuno's next-generation standard material that offers softness, excellent energy return, and a great light weight.