Nike Women's Free Trainer 7.0.IVWe have seen the success of Nike's Free technology in many models over the years. With the Free Trainer 7.0.IV Nike utilizes it again to create a breathable and lightweight cross-trainer. Designed to help you build strength and improve performance, they feature a synthetic leather upper with webbing straps attached to the laces, Phylite midsole with horizontal and vertical flex grooves, and strategic rubber pods on the outsole for traction.