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With one different temperature on each side. There are two lumens. One is an aerated normal temperature pillow, which is made of flocking cloth, and it is soft. The other is made of silica gel, its temperature is 5-to 10'C lower than the normal one. It is cool. Silica gel doesn't need cold cooling with the icebox. It is very easy to put it in the cold water or icebox refrigeration room (less than 10 minutes) to get cold cutting quickly. It can be used repeatedly. In the summer, use the normal temperature pillow in the room of air condition; use the cool pillow in the no air condition room. It could used on the desk for nap, or as a headrest.
