Promotional thermal mugs are great for keeping drinks hot. Many may not know however they are just as effective in keeping drinks cool too. So they work well as a promotional item for both summer time and winter time. So how exactly does a thermal mug work? How do they keep hot things hot yet still keep cold things cold. Well its all about conductivity ie. transfer of energy heat. You see when hot water is poured into a mug the surface of the mug will be colder than the water. After a short while the temperature of the water will come down and the temperature of the mug will go up and they will both reach an equal temperature point (vice versa for cold drinks and a warmer mug). Once this equal temperature is made your hot beverage will continuosly lose heat as it is transfered through the mug and onto your hand or the outside temperature...... this is for a regular mug.

A thermal mug however is different. It has 2 walls and a space in between. This space is typically filled with either foam, air or vaccum. A vaccum space works best but all of the others work quite well too. Heat does not conduct well through air. This means that in a thermal mug when heat escapes the first wall it stays there and does not venture further which in turn will keep your beverage hot. (or cold)

Over time though all hot beverages will get cold. It just takes a lot longer with a thermal mug because the only escape the heat can make is either through the top or the top edges of the mug where the 2 walls join together.

Promotional thermal mugs make for great promotional items simply because they work. They will keep beverages a lot hotter and colder for longer periods than conventonal cerramic promotional mugs!