If you are chilly, you can only appreciate the warmth of the Zippo hand warmer. You can use it seventy times without any problem. Beyond this catalytic combustion will be less efficient and produce lower heat. Therefore, it's better to replace it. This operation will also ensure safer operation of the main heater. The change of combustion is very simple . Thus equipped, your pocket heater will guarantee you long hours of protection against the cold. This burner is designed to fit an other Zippo handwarmers. It makes an excellent gift idea for man or woman.