Features:High-grade fabric: Made of 100DM four-way elastic composite polar fleece fabric, which has excellent thermal insulation performance, good stretchability, and slim and beautiful appearance.USB power supply: universal USB port power supply, convenient and fast, no need to worry about battery problems.Double button switch: 5V double button switch, which can control heating in different areas to meet personalized needs.Efficient heating: It uses carbon fiber for heating, which is efficient and durable. It has 5 heating zones (three on the back and two on the abdomen) to keep warm in all directions.Machine Washable: Use a mesh laundry bag, machine washing can also ensure the life of the heated vest.