Features1. Perfect to wear under jacket or coat for skiing, walking dog, office daily. It's simple to take it outdoors when completing activities such as fishing, hunting, mountain motorcycle or camping during the winter months. Heated vest helps to improve blood circulation, promote metabolism, reduce muscle stiffness. Withstand the cold winter.2. These heated vest keep you warm anywhere such as enjoy skiing,motorcycle,climbing,hiking, hunting,or office routine and business try during fall and winter.Fit for all kinds of scenes.3. This vest is very warm and comfortable, very light and thin making, ideal gift for family members, friends, employees. One size fits both men or women, thin or fat, young or old.4. It is powered by a USB power supply. It is recommended to purchase a 10000mAh mobile power bank, which has a single battery life of more than 8h, so that you can feel warm in extreme environments.Note: Please use a power bank with specifications above 10000mAh. Otherwise the vest will not work or be damaged Specification:Material: PolyesterColor: BlackPower supply mode: USB power supplySize: S M L XL 2XL 3XL 4XL 5XL 6XLPackage Includes:1 x Heated Jacket Vest