How do cooling sheets and pillows work? I bought some for the coming summer as my room has poor A/C. Now I find myself laying awake at night, wondering how they work? And they appear to have a limit to how cool they can get as I’ve already had some very hot nights that they feel just as warm. Is it a gel? Special fabric? Science explain.
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To understand that, you need to know that there is more than temperature of an item that determines how hot/cold it feels. It is mostly about how quickly heat enters or leaves your body, which is dependent on a property called thermal conduction. Something very conductive, like metal or stone, will feel much colder on a cool morning than something that is more of an insulator, like carpet, even though they are exactly the same temperature when you walk across them in the morning.
So, to answer your question, the way to make something feel cooler would be to make it out of more thermally conductive materials, spread your heat over a bigger area, which will more efficiently transfer your body heat out f your body to the room making you feel cooler.
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