The ActionHeat Cotton 5V Battery Heated Socks provide maximum warmth with advanced battery-powered technology. Built-in heating panels are strategically placed on the sole of the foot to deliver consistent heat using ultra-fine fibers. The socks feature heat-trapping fabric and touch-button control with three heat settings for customizable comfort. Powered by 5V rechargeable batteries, they provide up to 5 hours of adjustable warmth, making them ideal for outdoor activities or relaxing at home. Made from a cotton blend with polyester, nylon, and spandex, these socks are soft, flexible, and durable. WARNING: These socks get hot. Follow instructions and use them carefully. NOTE: Recommended to use low or medium settings. Heat Blast should not be used for more than 5 minutes at a time.