Mizuno WaveKnit R2 Mens Running Shoes. A SmoothRide midsole is engineered from a dual compound of U4icX and U4ic for the ultimate in cushioning.Knitted upper construction delivers a precise and comfortable fit and freedom of foot movement all run long.Features:SmoothRide midsoleU4icX and U4ic FoamUnique knitted uppercloudwave TechnologyX10 Rubber sole