Specification: Material: Acrylic Fibres Product Color: Black, Khaki, Gray, Red Voltage: 5V Temperature: 40-50 Degrees Product Size: 20 x 20cm? Product Weight: 150g 1Features:? 2Suitable Temperature: Winter warm electric heat hat with 40-50 degrees provides the appropriate temperature for everyone. 3USB Interface: With the USB interface design, the heated gloves hand warmers bag can be powered via your PC, power bank, car charger, and so on. 4Premium Material: Heated winter beanie hat made from acrylic, soft and comfortable to wear, perfect for sports & daily wear. 5Wide Application: This heat hat is ideal for skiing, snowboarding, snowmobile, snow shoveling, riding a motorcycle, climbing, hiking, hunting, mountaineering, etc.? 6Must Have For Winter: If you are spending a good deal of time outside in the winter taking care of various chores, especially shoveling snow, these USB electric heated hats can really help you out.?