1. Adjustable Heating TemperatureThree seconds fast heating, choose from 3 heating levels (Low: 45°C Medium: 50°C High: 55°C) to suit your comfort preference in cold weather, ensuring your ears stay comfortably warm without overheating. 2. BackWear Foldable DesignOur heated earmuffs are designed to be worn behind the head, comfortable to wear, and will not affect your hairstyle, hat or helmet. In addition, they are foldable for easy storage and carrying. 3. Warm LiningThe heated earmuffs feature a soft and comfortable lining, providing extra warmth and comfort, effectively protecting your ears from cold wind and low temperatures. Equipped with an automatic shutoff function (over 55°C) to ensure and power saving. 4. One Size Fits Most PeopleIt has good elasticity and fits the head circumference, suitable for most different head circumferences. Embedded with elastic memory wire, stable wearing and will not fall off.