Perfect for active feet, these children's Flex 2017 Run trainers from Nike keep them comfortable on the go. Made with a textile upper and supported with synthetic overlays, a Velcro ankle strap enhances the fit, sat on a dual-density midsole for optimum comfort. A tri-star outsole pattern flexes with their feet too, delivering a smoother, more natural step when they're out and about.. Material: Textile & Synthetic Upper/Synthetic Sole