- Size: XL • Made with cotton, polyester, and waterproof material to retain heat and protect against water and rain. • Large heating areas on the back and neck, using carbon fiber for safe and efficient heating. • Three adjustable temperature levels: high (50 °C), medium (40 °C), and low (30 °C), controlled with a button. • Compatible with most power banks on the market (not included), thanks to its USB connector. • Ideal for outdoor activities in cold climates, such as skiing, motorcycling, and outdoor work. • Promotes blood circulation and relieves muscle pain. • Color: Black