Blending barefoot-like running with modern fashion, the Nike FREE 4.0 v3 running shoe enhances your running experience and look. Seamless nanpryl upper promises a smooth, secure fit and features perforations that allow airflow to keep your feet cool and dry during long runs or intense workouts. For great foot flexibility, the Nike Free outsole is made with flex grooves that naturally increase the range of motion. Minimalistic sockliner conforms to your foot and softens impact forces. Wt. 6.6 oz.