Take your run to the next level with the Nike Free RN 2018. This lightweight running shoe is designed to keep all the benefits of the previous generation, but update features to help you stay even lighter on your feet. The breathable upper, lightweight midsole, and flexible outsole work together to allow a snug fit and natural stride. Circular-knit, spandex upper is designed to provide a fit that is snug, flexible and breathable. Laces are made with spandex for the perfect one-to-one fit that doesn't slide around. Flywire is integrated into all eyelets except for the top one to provide maximum flexibility where your foot and ankle naturally flex. Dynamic heel fit system reduces sliding and chafing for maximum comfort. Co-molded midsole included a soft layer of foam along with a firm, springy layer of responsive foam for cushioning that both absorbs shock and supports your feet. Tri-star outsole pattern is made for flexibility that moves with your natural stride.