The Nordic Gear Lectra battery-heated mitts provide you with reliable extra heat when you need it. You simply snap the battery pouch closed to activate the heat. They're constructed with a tough nylon taslan shell, Maxi grip palms, and comfortable Thinsulate™ lined snow cuffs.
They barely heat up and are very wide. Who has hands that wide? There's all this extra material on the sides of your hand. You have to add hand warmer in them in order to keep your hands warm. The mittens alone won't work.