Product Material: cotton cloth + carbon fiberSize: (flexible) sole length, 20 cm; sock length: 23 cm; sock opening: 9 cmBattery voltage: 3.7 VBattery capacity: 22004500 mAhTemperature control: 3 levels adjustableTemperature: low-end, 35 degrees Celsius; mid-range, 45 degrees Celsius; high-end, 55 degrees CelsiusColor: gray, blackQuantity: 1 pair1.3 HEAT SETTINGS: These heated socks are designed with 3 heat settings, including high heat between 35 C and 55 C. Make these electric heated socks ideal for keeping your feet warm in winter. Combined with two 4800mAh Large Capacity Battery these heated socks are great for Hunting, Fishing, Camping, Hiking, and working outside.2.Battery Operation & Enlarge the Heating Elements - To give your feet a more balanced warmth, our heated socks feature Enlarge the heating elements of the toes and soles of the feet. keep your feet warm all day when they are fully charged. PS: The display of the adapter lights up red during the charging process and green when fully charged.3. Flame retardant safety cotton - The heated warm socks are made of cotton, polyester, spandex. The breathable, quick-drying, specially developed, flame-retardant cotton makes you feel more secure during use. It is more important that the far infrared heating elements of the winter socks can stimulate the blood circulation. They are an ideal gift for people with arthritic feet and cold joints.4. Washable and an average size - The heated sock battery support hand wash and machine wash. Note: Please remember to put the charging cable in the socks first before washing. heated socks unisex with average size. One size that fits everyone, super elastic and stretchy for adults, men and women.5. Widely Used & Best Gift - Electric socks are perfect for a variety of indoor or outdoor events such as hunting, hiking, horse riding, fishing, biking, driving, running, camping, skiing, climbing, sleeping, etc. The Ski heated socks could also be an ideal gift for parents, friends, family members and the elderly.