What kind of travel mug keeps coffee warmer: plastic, stainless or ceramic?
The answer to this question is simple: vacuum insulated stainless steel cups will keep your coffee hot all the time.
That's because the vacuum layer doesn't transfer heat from the inside of the cup to the outside. A simple "double-walled" cup has an air layer that conducts some heat, while a foam insulated cup has a foam that conducts heat -- not much, but a hundred times the vacuum.
And our most stainless steel vacuum bottles can keep hot for more than 12 hours, keep cool for more than 24 hours. it also depends on the mouth size of the bottle, if it is a small mouth, can keep a vacuum for a longer time.