Features: 1.Thermal Insulation: The warm vest is filled with premium cotton, with multi layer fiber structure, thermal storage silver laminate fabric lining, effective reflection of infrared heat emitted by the body, lasting temperature lock, thin, warm and soft. 2.USB Interface Design: Universal USB mobile power interface, insulation and waterproof treatment, can be washed by whole immersion, convenient for clothes washing. 3.Exquisite Button: Single control 3 zone heating, three gears adjustable, intelligent temperature adjustment, one button operation, convenient and fast. 4.Long Life: As long as the voltage is 5V, the 10000mA battery(not included) can keep warm for 8 hours, ideal for hunting, skiing, fishing, motorcycle, camping, hiking, office, etc. 5.Practical Design: Fashionable and stylish stand collar design, wrap the neck, keep warm and comfortable, slightly elastic and comfortable sleeve cage edging design, avoid the cold wind, high capacity zipper pocket design, avoid the loss of items, safe and practical. Specification Item Type: Electric Heating Vest Material: Polyester Fiber Color: Black Size: M: Length: 58cm / 22.83in, Bust: 94cm / 37.01in, Shoulder: 35.3cm / 13.9in L: Length: 60cm / 23.62in, Bust: 98cm / 38.58in, Shoulder: 36.5cm / 14.37in XL: Length: 62cm / 24.41in, Bust: 102cm / 40.16in, Shoulder: 37.7cm / 14.84in 2XL: Length: 64cm / 25.2in, Bust: 106cm / 41.73in, Shoulder: 38.9cm / 15.31in Package List: 1 x Heating Vest