Wonderful gift, sweet warm friend family and yourself Easy to carry, the cooling pad is small in size and fit easily into your bag, making it easy to carry and use when you out and about , if the states of the cooling pad becomes liquefied, put it into the refrigerator for fifteen minutes, the neckband will solidification soon, which means you can use it again Suitable for hard Hats, hockey helmets, bike helmets and so on Materials, cooling pad make from pcm temperature control fabric, a revolutionary product designed with a special materials used to protecting astronauts ensures durability cooling effect.simply insert the pad into your Hats, refrigerate for ten minutes, and enhances comfort and coolness