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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Usually it’s two layers with air or some other insulation between them. If you don’t immediately feel the heat of your coffee on the outside of the vessel, that’s probably true for this thermos, too.
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