Jeff got the inspiration from the FREE series to design this training shoes that could help athletes to improve flexibility and speed, making the race when the wearer can have a better performance, more powerful and faster. FREE concept is split-type things at the end of training in a straight line so the results is that power from the heel to the front feet have a better transfer. Pre-curved palm grooves can enhance flexibility and help improve the training process in the range of motion, adjustable instep devil stick design, through the entire upper and help fixed feet, and to provide the best comfort, FREE concept outsole with Zoom Air in addition to strengthening the leg training, but also provides general training shoes by the unprecedented responsiveness. What is the most important is our shoes are non sales tax,free shipping and new.Quality is guaranteed and We will send goods tracking service.