The Nike Free RN Motion Flyknit 2017 is updated with a new midfoot strap design that allows snug, secure lockdown and eliminates pressure points for a comfortable, distraction-free fit. One-piece Flyknit upper for a snug fit and lightweight feel. Mid-cut collar allows the shoe to become a seamless extension of your foot. Anatomical rounded heel creates a smooth transition at heelstrike. Soft Phylon foam within a firm carrier combines comfort and durability for a smooth ride. Auxetic outsole design follows the natural motion of the foot, expanding at impact and contracting at toe-off, allowing a full range of motion throughout your stride.