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The Nike Free running shoe from the Nike running shoe company is designed for natural, free running with the ability to produce ‘supernatural runners’. It is therefore designed more as a training tool to strengthen the foot rather than as an everyday running shoe. It incorporates a breathable mesh upper which has an overlay for optimum fit and comfort as well as ventilation to cool the feet while running. The forefoot also includes Nike’s Zoom-Air unit technology which installs the Nike Free with ultimate shock absorption and cushioning to slow down foot fatigue. It is a super flexible shoe for runners with normal to flat arches who are looking to strengthen their feet.