The waistcoat is equipped with heating panels located on the back, which provide an even and regular temperature. This allows you to enjoy warmth on colder days.The heat emitted by the waistcoat helps with muscle relaxation and back pain.The sleeveless vest has three massage modes that will aid blood circulation and relax tense muscles.The massage panel is located on the back of the waistcoat. Relaxation Muscle fatigue Reduces swellingFor back painsFor people who like heat