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. BEST FOR: Everyday Run Race FEATURES: Engineered mesh Anatomical Achilles construction PROFLY™ construction Early stage Meta-Rocker Rubberized EVA outsole Good condition, light wear to uppers. Some wear to tread.