The Whitby Hand Warmer provides a fast, easy and safe solution to the problem of cold hands, whatever you activity. Whether it's shooting, walking, beating, riding or fishing, the Whitby Hand Warmer will have your hands warm in no time. With a burn time of up to 12 hours (depending on the fill) you can have portable heat on the go, all day long. The hand warmer heats using a 'flameless' catalytic warmer, ensuring that it is safe and effective. The replaceable burner has a life time of 90 burns, assuming a 12 hour burn.