Vibrantly colourful and fun these adorable knitted hand warmers contain a reusable click gel heat pack simply hold one in each hand or slip one into each of your pockets to heat simply hold the metal chip inside the hand warmer between your thumb and forefinger and bend gently until it clicks the solution will crystallize and release heat massaging the pack will help maximise the heat the hand warmer will stay warm for about 45 minutes to reactivate the gel pack when cold and