... of cool mat, we begin it, and we got the patent for invention of PCM PCM Patent 2. Our PCM, the filling material, higher quality and ... ( soft and comfortable). * Learn About PCM & GELPCM: Phase change material, a substance with a high heat of fusion which, melting and ... aqua-gel, or more simply we call it water gel.High flexibility & High intensity * Contrast between PCM cool pillow and Gel ...