Mizuno Wave Mujin 9 Womens features Foam Wave, two foams with different densities in a wave geometry, boosts stability from heel to toe while maintaining a soft, smooth ride. Constructed with a MIZUNO ENERZY bottom layer for softness and energy return and U4icX top layer for stability. Michelin Rubber in an aggressive design increases traction, durability, stability and adaptability on any terrain.