Keep your hands warm and toasty all day long with Grabber 12 Hour Pocket Warmer. This portable heat source provides instant heat and lasts for up to 12 hours. It&';s perfect for skiers, hunters, fishermen, golfers, campers or anyone who works or plays in the cold. The air activated warmer is easy to use and does not require batteries. 12 Hour Averages 135Adeg F for 12 hours. Perfect for hunters, campers, skiers, etc.