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 upon opening the packaging and provide up to 12 hours of natural warmth. No more cold hands: The heat pads are especially popular among stadium visitors or children, as they help make the school journey easier in freezing 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 recommended to place the heat pad in your jacket or pants pocket. Even in gloves, the insulation provides optimal warmth.