Rubber sole The Nike Free RN Flyknit 2018 features a classic color combination on the innovative running shoe Extremely lightweight, the quick performance sneaker mimics the feeling of barefoot running while providing stellar protection for the foot Dressed with a Flyknit upper shaded in black, the side Swoosh stands out in white The sock-like fit is updated with more stretch, while the lightweight sole supports the foot's natural movement with a state-of-the-art auxetic tri-star pattern The Nike Free RN Flyknit 2018 features a classic color combination on the innovative running shoe. Extremely lightweight, the quick performance sneaker mimics the feeling of barefoot running while providing stellar protection for the foot. Dressed with a Flyknit upper shaded in black, the side Swoosh stands out in white. The sock-like fit is updated with more stretch, while the lightweight sole supports the foot's natural movement with a state-of-the-art auxetic tri-star pattern.