Magic Cool weights on 12 gram before activating. After the customer place it in a bowl with ordinary tap water the Superabsorbent Crystal Polymer inside the scarf will turn into a water - based gel like magic. If water evaporates it will produce cool. After cooling it will get back to it's original crystal structure. This can be done hundred times and more. The cooling time depends on the outside temperature. High temperature will produce a high cooling effect.