The Reebok RunTone running shoe provides muscle activation, toning, strength and endurance. The running shoe creates a slight instability, much like running on sand, which encourages increased muscle activation in three key areas of the leg: the gluteus Maximus, hamstrings and calves. Reebok Runtone Action works while you walk the dog, dancing, and running. The synthetic/mesh upper offers comfort, fit and durability. SmoothFit gives comfort by using a smooth seamed liner. IMEVA midsole adds cushioning. Removable PU sockliner accommodates orthotics. Beveled heel construction enhances the running stride.