Rendered in wool and leather, the Nike Free Run winterizes the runner by swapping out its typically mesh upper. Featuring a durable midfoot cage, mudguard and heel clip, the sneaker provides support and stability. Laser-cut details reveal artful accents below, while branding makes a subtle appearance on the heel and tongue. The Nike Free sole helps improve range of motion for a barefoot-like feel. The shoe was created to be compatible with Nike+, a sensor (sold separately) designed to track running performance.