The BCB body warmer keeps your body warm when you have to deal with cold conditions. Typically these packs are used for comfort, but increasingly they are being used in rescue operations where a survivor is trapped in a cold or exposed place.
Operation:
Opening the sealed package causes oxygen to react with the bag. Within a minute the bag gives off constant heat. Place the pack in your pocket or anywhere close to your body where warmth is needed and it will maintain a comfortable temperature of 50°C (Max 65°C) for up to 24 hours.