DEEP FLEX GROOVES FLEXBILITY & COMFORT SOFTFOAM+ OPTIMAL STEP-IN COMFORT EVA MIDSOLE - CUSHIONING? The INTERFLEX is all about STYLE X COMFORT. The fashionable upper design gives a stylistic approach to a light-weight, everyday cushioning runner. Deep flex grooves in the EVA midsole provide FLEXIBILTY. Smooth Cushioned and Lightweight Ride. The SOFTFOAM sock liner combined with the EVA FLEX midsole gives you a comfortable ride. ? Stylish Upper: A blend of athletic meshes & synthetic leather