Nike Flex Experience Run 9 Men's Running Shoe SECURE, NATURAL MOVEMENT. The Nike Flex Experience Run 9 is built for natural motion. Secure support helps your foot stay in place, while a ventilated upper promotes airflow. Its versatile design delivers comfort no matter the run. Made To Move Flex grooves in the outsole move naturally with your foot, delivering comfort with every step. Stretchy material at the toe helps you move freely during your run. Lightweight Support A deconstructed heel conforms to your foot, helping you stay secure during your route. Support at the midfoot adds a snug fit. Mesh at the upper helps promote airflow. Loop at the tongue for easy on and off.