Skechers Shape-Ups Women's Jump Start Lace-Up Shoes shape up your legs with every step you take... jump start your new exercise program today! Walking on hard surfaces in ordinary footwear can lead to stress on your feet, knees and lower back. Skechers developed the Shape-Ups collection with a three-part system to soften the impact. A polyurethane kinetic wedge in the heel creates the feeling of walking on a soft surface, like sand. Thanks to the firm polyurethane midsole, you'll still get plenty of support. Plus, the rolling outsole propels you into the next step for an easy walk. This system helps ease stress on joints, promotes correct posture and engages muscles to help keep your center of balance.