The Nike Free Technology represents a brand new approach to running and is acclaimed worldwide as one of the most relevant recent innovations in terms of running performance. The Nike Free consists of deep grooves carved throughout the whole outsole, allowing for a natural foot movement, close to what you would experience if running barefoot. The results are astounding: more flexibility, more feel, more lightness The Nike Free technology works so well that many professional coaches are pushing their athletes to use it while training or competing. Further than that, the Nike Free Run 2s upper is built to maximize comfort and foot support. Also, The Nike Free Run also boasts the Nike system, allowing for real-time tracking and analysis of your running performances.