Note: Please allow slight size error due to manual measurement. Thanks for your understanding. specification: Item Type: Heated Socks_x000D_Material: Cotton+Polyester_x000D_Battery Box Battery Model: A single battery box needs to install 3 x AA batteries (not included), a total of 6 x AA batteries (not included)_x000D_Product Size:_x000D_Foot Sole Length: Approx. 21cm / 8.3in_x000D_Tube Length: Approx. 27cm / 10.6in Features: 1Protect and warm your foot, improve blood circulation, prevent foot cracking and injury in cold weather. 2Made of thickened cotton material, super comfortable to wear, breathable and well filled, soft and elastic. 3Ideal for different indoor and outdoor activities such as skiing, fishing, hiking, walking and camping, etc. 4Mobile battery box can be equipped with 3 AA batteries (not included) per box, keeps warm for a long time, and can be completely put into the socks. 5Washable, safe and no electric leakage. Folding design, light weight and in small size, perfect for home and travel use. PackageList: 2 x Heated Socks 2 x Dry Battery Box 1 x Manual