Freezer Hot Sheet, Strong Cooling Sheet, For Adults, 12 x 2 Boxes (24 Total), As the package changes may arrive different from the images shown. If packaging is important, please do not purchase this cooling sheet that can be used in the freezer. When you want a firm cooling, just pop it out of the freezer and stick it on your forehead. ● Permanent freezing gel dissolves thoroughly and cools forehead strongly by -10 degrees. The normal cooling effect lasts for about 4 hours.