... keeps the temperature cool. When the temperature is below 30 degree, the PCM is in solid state, we can feel ... cool in this situation. When the temperature is above 30 degree, it can absorb the body heat and constantly change ... everyone's feeling.3.When the temperature is above 40 degree, the cooling feeling is not so good, what is ... .,Ltd(In Japan)84.Itochu Coperation(in Japan). laptop cooler 20*35cm