This running shoe is built for the neutral to under-pronator who requires enhanced cushioning. Lavish your feet in comfort with this state of the art cushioning shoe. Upper consists of breathable mesh with supportive overlays, and external anatomically shaped heel counter. Midsole consists of: Zoom air units in the forefoot and heel Full Nike CUSHLON midsole for a responsive ride Fitsole sockliner molds to your foot for a custom fit Natural Motion Engineered women s specific crash pads help control pronation; Nike+ enabled so you can track all your hard work and dedication. Outsole consists of: BRS 1000 rubber on the heel for greater traction Duralon cushioned forefoot for extra comfort and durability Deep flex grooves help provide a smooth transition during the gait cycle