Merlin Thermavolt Heated Socks Designed as an outer layer sock, the ThermaVolt offers innovative warming with its micro carbon fiber heating panels located at the top and instep - prime areas for heat distribution. These socks can function independently with 2200mAh batteries or be integrated with ThermaVolt pants for an all-in-one heating solution via a motorcycle's battery. The incorporation of three adjustable heat settings, operated by the Merlin power unit, makes managing warmth straightforward and hassle-free. Features: Soft, quick-drying and warm wool construction Micro carbon heating panels around the toes and instep Merlin-branded power control unit Elasticated panel and connector cable at top of calf East connect pluf inside of calf pocket Interconnected design enabling garments to link (jacket-pants-socks) Battery life - High 4 hours Medium 6 hours Low 9 hours