GoFits faster and more effective way to roll-out cold therapy fits right in the palm of your hand. Grip the Polar Roller handle comfortably with either hand, while the stainless roller ball stays ice cold. Rolling out swollen, sore muscles is a breeze. Place the detachable roller ball in the freezer between uses. The unique inner liquid stays cold for an extended time, offering active, cold-therapy relief, with no wet mess or cold hands. Patent Pending