Hand warmers, often referred to as pocket heaters or hand warmers, are simply placed in your hands or pockets. They are activated by contact with oxygen when the packaging is opened and provide up to 12 hours of natural warmth. No more cold hands: The heat pads are particularly popular among stadium visitors or children, as they make the journey to school easier in icy temperatures. Alpine skiers and mountain bikers also appreciate the benefits of hand warmers, which can be easily used inside gloves. Application: Simply unpack and use the warmer. For better heat development, it is advisable to place the heat pad in your jacket or pants pocket. The insulation inside the glove also ensures optimal heat retention.