This running shoe is built for the neutral to under-pronator who requires enhanced cushioning. If you're looking for maximum cushioning you found the only shoe you need. Synthetic leather upper with supportive synthetic overlays. New durable low pressure Air-Sole unit combined with a Phylon midsole will put your feet in cushion heaven. Nike+ enabled so you can track all your hard work and dedication. BRS 1000 rubber outsole with Natural Motion Engineered flex grooves for traction and flexibility.