Feature: 1. After power through the battery, intelligent temperature control switch can be adjusted three gears temperature. 2. Perfect for arthritic feet and long-term cold feet and stiff joints. Give you a warm winter. 3. Soft comfort for feet, elasticity. 4. The socks are free size, perfect for both men and women. 5. The socks with battery box can be as a nice warm heart gift for family, parents, friend in cold weather. 6. Perfect indoor warm feet gear for cold weather. Also fine for outdoor athletic activities. 7. Cotton material, absorbent, breathable, quick-drying, elastic thickened. Specification: Battery heating socks, suitable for winter Cycle, motorcycle riding, hunting, fishing, camping, etc. Features: After power through the battery, intelligent temperature control switch can be adjusted three gears temperature. Perfect for arthritic feet and long-term cold feet and stiff joints. Give you a warm winter. Soft comfort for feet, elasticity. The socks are free size, perfect for both men and women. The socks with battery box can be as a nice warm heart gift for family, parents, friend in cold weather. Perfect indoor warm feet gear for cold weather. Also fine for outdoor athletic activities. Cotton material, absorbent, breathable, quick-drying, elastic thickened. Specifications: Type: type A, type B, type C, type D (optional) Material: cotton Size: one size Package size: 210 * 120 * 70mm / 8.3 * 4.7 * 2.8in Package weight: 250g / 8.8ounce Note: Battery box requires AA batteries. The shipment does not include batteries, you need to prepare AA batteries yourself. Packing List: 1 * Pair of Socks 1 * Battery Box Package List: 1 * Pair of Socks 1 * Battery Box