The MW1645GR is now available at Shop New Balance for $71.99. Give your walking regimen an extra boost of energy and toning power with rock&tone! The 1645's cutting-edge rocker bottom tones your muscles and burns extra calories while you walk, and the durable suede and mesh upper is based on the ever-popular 645 trail walking shoe. NB's rock&tone shoe helps you get & stay healthy as you simply walk throughout your day--you can even feel it working!