... ! Light, soft, roll it and take it anywhere and anytime with you. Thrid generation product, patent product, patent number: 201020250301.7Brand ... kind of macromolecule cool-storing substance, which can automatically form ice crystal (granules) in a temperature below 25 degrees so as ... , it can absorb a large amount of heat energy, meanwhile, ice crystal (granules) will begin to melt.2. Easy to use ...