Yes, it can also keep things cold.
Long Johns for pants thermos but I dont know what the shirts are called.
A thermos will generally keep either a hot item hot or a cold item cold. you can use them for things like cold drinks, soup, hot chocolate, or pretty much any liquid you want to keep the same temperature.
keep it in a hot place
stove microwave hot pack toaster coffee maker thermos stoneware crock
This will depend upon the Thermos, but in general a thermos will keep hot liquids hotter for longer. This is because the Thermos has stronger insulating properties.
Put the drinks in a thermos
A thermos is a container that will keep beverages hot.
To keep hot liquids hot and cold liquids cold by minimizing heat transfer between the inside of the thermos with the outside.
Utility
Most times its because there is no air in between the outside layer of the thermos and the inside layer of the thermos.
Put them in a thermos :D
If you look inside of a thermos you will see metal. This absorbs the heat or the cold and keeps it that way for as long as the contents are in the thermos.