Get excited for every run in the Mach 4. Inspired by the propulsive speed of the Rocket X and Carbon X, the Mach 4 employs a harmonious blend of foams – merging an incredibly soft, lightweight foam on top with rubberized foam directly beneath. The Mach 4 features Anatomical Achillies Construction for maximal comfort and support, a PROFLY Midsole for cushioned landings and propulsive toe-off, engineered mesh construction for breathable comfort, and a rubberized EVA Outsole for lightweight ground contact, Hoka One One Men’s Mach 4 Running Shoe