You will not have to worry about having your hands frozen, even if the cold is hard. This Zippo hand warmer will warm them up very quickly. Remove the hand warmer cover, turn on the catalytic burner and allow it to warm up for a few moments. For greater efficiency and protection, the heater should be installed in its case. After that, you just have to put it in your pocket. Your hands will be warm for a long time. Indeed, your hand warmer will start to be less effective after 70 uses! What protect your hands frostbite for much of the winter.