3 layers of comfort (antifreeze gel, frozen gel, insulated sheet) keep your pillow cool for hours while maintaining a soft feel. Cold for 12-14 hours and can be reused. For sleeping in summer. For heating. Ingredients: Water, propylene glycol, gelizer, preservative. How to use: Place it horizontally in the freezer, cool it for more than 10 hours, then roll it up with your own towel. When that happens, please make sure that the display surface is placed in the freezer and the antifrozen gel may freeze. In that case, please leave it at room temperature for a while before using.