Which is colder? Cold thermos or a cold thermos-filled coffee mug?
The coldest thermos you can get is a coffee mug that is only 80 degrees Fahrenheit.
This is cold enough to cause hypothermia, and it’s also not hot enough to be good for your heart.
The coffee mug comes with a stainless steel lid, which keeps the heat out of your system.
The only downside to this is that you need to buy a thermos that has a heat sink that is not too big to fit your coffee mug.
So, what are you waiting for?
Go ahead, get one.
(Read more about thermos mug)