Mattress pad for futon, for bed, or for mattress filled with a gel like chemical substance having a cooling effect, mattress pad for pillow filled with a gel-like chemical substance having a cooling effect, futon filled with a gel-like chemical substance having a cooling effect, and pillow cover filled with a gel-like chemical substance having a cooling effect

Mattress pad for futon, for bed, or for mattress filled with a gel-like chemical substance having a cooling effect, mattress pad for pillow filled with a gel-like chemical substance having a cooling effect, futon filled with a gel-like chemical substance having a cooling effect, and pillow cover filled with a gel-like chemical substance having a cooling effect