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This is an anti-frozen gel-type cooling pillow that fits softly without freezing. Cold stays 3 to 6 hours. (There may be individual differences in the feeling of cold temperature. In addition, the duration may vary depending on the room temperature and the environment used. Can be re-positioned. For sleeping in summer. For heating. If you want to cool it down from bruises or spills. For freezers. [Uses] Cooling the head, etc.