You need not to spend a lot of time in gym as this grey and black SKECHER RESISTANCE RUNNER is a superior choice for those who wish to maximize the effort-to-reward relationship in their training. This shoe allows you to work harder, burning more calories, while protecting your muscles and joints. Called as an "intelligent" shoe, the Kinetic return system helps the body to return in its natural state without any injury, whereas the Resamax kinetic wedge technology creates resistance and enhance your performance. Antibacterial sockliner Optimum traction outsole