The ActionHeat AA battery heated mittens are great for any outdoor activity. With an easy on/off button it s easy to add warmth and keep your hands nice and toasty. Weather resistant softshell & cozy fleece lining provides warmth comfort and versatility. Strategically placed heating elements use ultra-fine fibers for optimal heating performance. An integrated heating system located on the back of the hand. The AA mittens have one heat setting that reaches 120F and lasts up to 4+ Hours.