Material: polyester fiberColour: BlackSize: L/XL/XXL/XXXLApplicable people: adult male/female or older childrenApplicable scenarios: outdoor and indoor activities such as fishing, cycling, skiing, watching games, etc. 11. Keep warm: Smart zone 2 heating (back *1, neck *1). Press and hold for 3 seconds to turn on, and just press the button to adjust 3 heating settings (blue light 30C, white light 40C, red light 50C). 22. Fast and long-lasting heating: Use a USB port power bank (not included) with a capacity of 5V 10000 mA or more, connected to the USB socket in the inner pocket of the clothes, and heat up quickly in a short period of time. A single charge can last up to 12 hours. The USB port can charge the smartphone. 33. More functions: warm-up, consume excess calories, increase blood oxygen and fluidity. It can improve the body's microcirculation, dredge the meridians, eliminate local discomfort and inflammation, relieve women's menstrual dysmenorrhea, reduce physical strength during this period, and give a girlfriend the best gift. Activate various functions between the skin and promote metabolism. 44. Suitable for all occasions: very suitable for daily commuting, walking the dog in the cool autumn sky, following your favorite football team, wearing a winter jacket, or even in an office that is too cold! 55. Easy to wash and easy to take care of: machine washable, be sure to take out the power bank before washing, insert the USB plug into the inner bag, put it in the laundry bag and then machine wash.