Nike Free RN 2018 Men's Running Shoe has been updated to deliver an even more adaptive fit than before. New stretch material in the upper moves with your foot, while the tri-star outsole pattern adjusts to your every step for a ride that delivers support and flexibility just where you need it. Circular-knit upper is made with spandex for natural movement. Dynamic heel fit system supports from heel to ankle. Tri-star outsole pattern adapts to your step for flexible cushioning.