... ice mat,made of special nanometer energy storage phase change material,can absorb the heat.it is widely used. ... treatment)filler a specific high-tech nanometer ice-pad material Product Size 30*35cm,30*40cm ,40cm*45cm ... it crystallized.3,The filler use the environment protection material, no harm to the body, and can ... for more than 3 years.4,The surface material of Ice Pad use PVC under special treatment ...