Which laptop pad material will be good? Metal, Plastic, Wood? Why?

Which laptop pad material will be good? Metal, Plastic, Wood? Why?
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#1

I have Dell XPS 15 old model and its so huge to use whenever I keep it on my lap. I want to get a laptop pad or platform for this, which material will be good to pick for the pad… should it be metal, plastic or wood? Asking this mainly because im confused which material absorbs heat and which will be good for long use. Please advice!