I: Designed for interior, preferably a suit or jacket outside. The newly updated Heated Vestheated Down Vest acts as a personal radiator to keep your body warm at all times. As a form of hyperthermia, the vest promotes healthy blood flow, increases oxygen and nutrient flow to muscles, relieves pain, reduces recovery time, and improves overall performance. It is designed for most people, such as cold weather workers and others who do outdoor activities such as biking, hiking and other winter sports. 11 Updated Heated Zones Professional heating vests add more heating zones, compared to other old heated garments, they only have 5 heating zones. Our new vest covers 9 heating zones with built-in premium carbon nanofiber heating elements, lightweight, flexible and safe to use thanks to its rapid heating technology. Generates continuous heat to many acupuncture points and meridians, including the back, abdomen, shoulders and waist, helping to keep the body warm. 3 power switches and 3 heating levels Triple switch design should, waist and abdomen switches can be operated separately, 3 heating levels from 40/104 to 65/149. Customers can choose the heating method of the heating pad according to their own needs. Your body will be comfortable, won't sweat from overheating, and be as comfortable as spring. The individually controlled design makes your device more power efficient and durable. Safety guarantee built-in thermal protection module. Once it overheats, it stops until the heat returns to standard temperature, so it is 100% safe to use. It can be used in conjunction with ordinary mobile power supply with ordinary USB port, and you can choose high-capacity mobile power supply or prepare multiple batteries in advance. (excluding power bank)Quality Assurance and Best Customer Service Please choose the right size according to the size chart. Best of all, by buying with us, you are partnering with a company that guarantees the quality of every product that leaves the factory. Even better, we provide complete client