Experts say that while running barefoot you are forced to naturally improve your running gait and and the same time strengthen foot and legs muscles.Nike Free Sale is technology developed by Nike,Inc.Feel the freedom of barefoot running with technology to provide you excellent support and cushioning in the Nike Free 3.0 shoes.Two-panel mesh upper for a spike-like fitCompression molded EVA midsole with nike free running shoes for increased flexibility.Two panels of synthetic leather combined with mesh give this shoe a spike-like fit for a racing feel.