Features: Comfortable material, suitable for a variety of occasions. With 3 levels of different regulated heating temperatures. (45℃ / 35℃ / 25℃) The component heating layer with heating elements generating heat for your back and neck. It warms the human body, consumes excess heat, increases blood oxygen and fluidity. Activates various functions between skin and promotes metabolism. Machine washable and hand washable, please take out the powers-outlet and put the USB plug into your pocket before washing.