Hot & Cold Rings:Powered by Cryothermal Technology™The TheraFace Hot and Cold Rings, which attach to your TheraFace PRO device, feature a combined 6 varying temperature settings to better help your skin absorb creams, help reduce facial puffiness, improve radiance, and much more.Hot Ring:●Relaxes and reduces tension ●Decreases muscle spasms ●Increases blood flow Cold Ring:●Decreases pain ●Decreases inflammation●Decreases muscle spasms PRO tip:The Cold Ring attachment can be used with your favourite percussive attachment for the ultimate treatment to depuff and relax your facial muscles.