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Wherever you run, whenever you run, however you run - run free with the barely there feel of the Nike Free Flyknit 2017. To make the shoe feel like an extension of your foot, Nike began with a seamless Flyknit upper that supports without restricting, moving with you as you run. Next, a light yet durable foam unit doubles as both midsole and outsole, keeping the shoe's overall weight at a minimum without sacrificing underfoot protection. Deep flex grooves are cut into the foam, creating an auxetic tri-star pattern that expands and opens at heelstrike, following the natural movement of your foot while evenly dispersing the forces of impact. At toe-off, this flex pattern contracts, allowing energy to return tour next stride.