Cotton heated socks Safe and Warm Socks: Heated socks equip with 2 battery boxes, powered by 6xAA 1.5V batteries (not included), providing you with up to 5 hours enduring warmth. Independent battery box are very safe and convenient to use, and keep your feet warm in the winter days. Soft Breathable Insulated Material: Heated socks are made of premium cotton fiber, soft and absorbent, quick-drying and breathable, quick-drying and elastic. Insulated material offers you safe socks.