Features: Experience quick warmth in freezing weather with this USB powered heated cap featuring advanced thermal technology, delivering continuous heat through any compatible power supply via its USB interfaces. Crafted from breathable polyester fabric, this heated cap maintains shape retention while offering superior insulation and soft comfort for extended wear during outdoor activities. Ideal for cyclists, delivery personnel, winter sports enthusiasts, and outdoor workers requiring head warmth during prolonged exposure to cold environments. Perfect for commuting, camping adventures, or mountain hikes, this heated cap keeps users cozy whether navigating city streets or exploring wilderness trail. Designed with safety mechanisms and machine washable functionality, this smart heating cap ensures easy operations and easy maintenance for families with children or elderly users. Specifications: Component: Polyester Color: 3 Option Head Circumference: Approx. 55-60cm/21.65-23.62inch Quantity: 1 Pc Package Includes: 1x Heating Cap note: 1.Please allow 1-2cm errors due to manual measurement, note that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item. 3.This product does not include power supply. Please prepare a small power supply device by yourself before use.