Warmawear Battery Heated Socks with Reflective Strip Carbon ceramic heating element is reliable and energy efficient, promoting longer battery life Socks are made of a warm, wool-rich material which will help to keep your feet toasty even when the socks are switched off Reflective stripes allow you to remain visible in the dark - great for cyclists Toe level heating element - combat the cold where it matters most Soft, stretchy cuff provides a more comfortable fit and prevents heat from escaping