FIT FOR TRAINING. MADE FOR YOU. The Nike Free 5.0 TR Fit 5 Metallic Women’s Training Shoe is ideal for cardio, strength training and other gym workouts with an ultra-flexible midsole and lightweight mesh upper designed for training-specific movements.Natural Flexibility New hexagonal flex grooves are hot-knife cut into the midsole to create six different flex points that allow your foot to move more naturally than ever before.Locked-Down Fit Molded foam conforms to your heel and helps anchor your foot to the footbed for a secure, comfortable fit and feel.Dynamic Support Flywire cables surround your foot and provide support and stability for quick movements and changes in direction, helping you stay focused through your most intense workouts.More Benefits Lightweight mesh upper varies in texture for ventilation and training-specific supportInjected midsole unit for ultra-lightweight cushioningStrategically placed rubber pods on the heel, toe and sides for durability and traction8mm difference between heel and forefootNike Free OriginsAfter learning that Stanford athletes had been training barefoot on the university's golf course, three of Nike's most innovative and creative employees set out to develop a shoe that felt natural and weightless, similar to bare feet. In 2002, they examined a group of men and women with pressure measuring insoles taped to their feet, using high-speed cameras to capture images of each foot in motion. The team spent eight years studying the biomechanics of shoeless running. The results yielded a profound understanding of the foot's natural landing angle, pressure and toe position, allowing Nike designers to build an unconventional and flexible running shoe from the inside out.