First, it’s worth understanding how a thermal mug differs from a thermos.
Essentially this is the same thermos, only smaller.
Typically, the volume of such a container averages from 250 ml to 700 ml.
When choosing a plastic mug, pay attention to the “PP” marking, which should be there. The "PP" or 5 in a triangle sign means that the cookware is made of polypropylene, a plastic that does not become dangerous when it comes into contact with a hot drink.
Labeling in the form of a glass and fork is also required - this means the plastic is food grade.
Ceramic coffee mugs are heavy and massive. Unlike porcelain cups, their walls do not show through in the sun.
Thanks to their thick walls, they retain heat longer than other cookware.
Ceramic mugs are the best option for daily use at home, office or coffee shop.
To keep tea hot longer, it is better to choose flasks made of metal or glass.
These materials retain heat well under vacuum or inert gas conditions. Plastic products are also made, but their heat-saving effect is very weak.