My wife recently got me a new travel coffee mug and it’s the best one I have ever had as far as keeping the coffee really really hot for a long time. It is very thin walled and I just don’t understand how the heat does not transfer to the outside surface of the cup.
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If it was just a thin metal wall then the wall would quickly feel hot and the coffee would cool down.
Chances are that’s not the case, based purely on you saying that it works really well. It is probably double walled with either a thin layer of some insulation between the two metal walls, or if the metal is thick enough it could have a vacuum between the walls.
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