Warmers offer instant heat on cold winter days, with smart technology metal disks and a fluid gel pad which crystallises upon use the hand warmers gently mould into your palms, releasing heat for your cold winter mornings. Ideal for Skiing, hiking or even morning dog-walking, our Hand Warmers allow you to comfortably embrace the winter and stay active. In order to reuse you must boil it in a pan of constantly boiling water for 10-15 minutes, placing it in a bowl of hot water will not work.