Mizuno features what it calls “Foam Wave,” two layers of foam in the midsole. On the top layer is U4icX foam—which, contrary to how it sounds, is not the name of one of Elon Musk’s 14 children. This is a firmer foam offering stability without feeling too stiff. Underneath, the midsole is greatly enhanced with nitrogen-infused ENERZY NXT foam for increased energy return.
