Just left by themselves in a colder environment, metals and ceramics and stuff get significantly colder to the touch than plastic objects or similar materials, like wood or cloth. Why?
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You can’t detect temperature, you can only detect if your skin is gaining/losing heat and how quickly
If you touch a big block of plastic its a terrible conductor of heat so your body quickly heats up a thin layer on the outside to match the temperature of your body and then very little heat moves so it feels warmer to you
If you touch a big block of metal its a good conductor of heat so when you heat up that tiny layer that heat is pulled away into the rest of the block and you keep having to heat that area up so your body detects heat is consistently flowing out and that its flowing pretty quickly so you detect that object as cold
Put a relatively thin layer of insulating plastic around that metal and suddenly it seems a lot warmer to the touch because the plastic pretty much stops the heatflow.
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