Step into a shoe that combines natural running feel with a great look. Exclusive RealFlex technology helps promote natural movement of the foot. Individual flex-friendly "nodes" on the sole are designed to help your feet move and flex as you run. The single layer polyester mesh upper of the RealFlex Optimal is reinforced with a hotmelt appliqu? for added lightweight stability. A slim micro suede tongue promotes the barely there natural feel. The full collar lining and added heel counter provide extra comfort throughout your run, while the molded sock liner provides cushioning.