These heat packs offer a unique opportunity to get the message across. With a snap of the activator disc the user will both see the liquid content crystallise and feel the product heat up to over 50° in under 30 seconds. What better way to make a lasting impression? The heat packs are placed in simmering water for 10-12 minutes to return them to the original state, ready to use again, a process which can be repeated hundreds of times. Comes in natural or white phthalate free PVC.