Features 1、The socks with battery box can be as a nice warm heart gift for Family, Parents, Friend in Cold Weather. 2、The socks are free size, perfect for both men and women. 3、Brushed soft comfort for feet, elasticity. 4、Also fine for outdoor athletic activities-outdoor trail. Battery heating socks, suitable for Cycle, motorcycle, hunting, fishing, camping, etc. Features: Brushed 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-outdoor trail. Specifications: Color: black Size: one size Material: cotton Battery quantity: 2pcs battery for each sock, 3pcs battery for each sock (optional) Battery: AA battery (not included) Package size: 130 * 120 * 60mm / 5.1 * 4.7 * 2.4in Package weight: 156g / 5.5ounce Packing List: 1 * Pair of Socks 2 * Battery Box(without battery) Package List 1 * Pair of Socks 2 * Battery Box(without battery)