Because of how quickly they absorb temperature.
If they are thermally conductive that means they absorb or shed heat energy quickly. This is why you use copper for cooling CPUs. Copper will steal heat quickly.
If your feet are warmer than the metal, it will quickly steal the heat in your feet. It will quickly make you feel colder.
Wood is a crap thermal conductor. Which means it can’t steal your feet heat very fast. So it feels warmer.
We call things that are crap at that… insulators. Insulation. Insulation feels warm… because it doesn’t absorb much of your own heat at all, and your own heat output can be faster than the insulator can get rid of it… so you warm up.
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