Promotional Thermal Mugs

Most Advertising Thermal mugs are built from Plastic or Stainless Steel.

Stainless steel as a Metal is very effective a retaining heat as a thermal conductor.
Heat is retained in an inner chamber surrounded by an outer chamber stopping the conduction of air around the fluid.

The absence of air in the form of a vacuum is the primary reason hot beverages retain the warmth, a lot of thermal mugs are built with double walls. The walled insulation allows for the hot air within the mug chamber to sit between the layers and retain the heat as it has nowhere to escape.

Styrofoam can also be contained with the Printed Thermal Mug build offering the same insulating properties and keeping your beverage at a steady temperature.