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Nike Men's Free RN Flyknit 2017 Running Shoes Flyknit constructed upper delivers zoned stretch and support Auxetic outsole pattern expands with your step to provide flexible cushioning Flywire technology woven into the upper integrates with the laces for a dynamic, supportive fit through the midfoot Low-profile injected unit sole (IU) foam provides a resilient ride and is tough enough to double as an outsole, dramatically reducing the shoe's overall weight Anatomical heel is rounded to roll with the ground, promoting a more natural range of motion