Nordic Gear Lectra Sox® Battery-Heated Socks feature a unique battery-heated design for hours of maintained warmth with reinforced heels and toes. The socks provide 6 - 8 hours of warmth and 1-hand on and off operation for convenient use. The battery-heated design is great for winter sports, hunting, hiking, watching sports or even just walking the dog!. The battery pouch is detachable so it can be conveniently worn on a belt or kept in your pocket until needed. With a pair of battery-powered Lectra Battery Heated Socks, you'll be feeling perfectly comfortable and toasty in the coldest temperatures.