Though at first glance a appropriate simple object, the mug serves a count of functions which make it especially suited to holding hot liquids:
The mug stores some hotness from the beverage, and so prevents it from cooling too quickly. The design of a mug helps insulation: (i) thick walls separate the beverage from the shivery external air, and (ii) Photo Mugs an indented loathsome separates the beverage from the surface upon which the mug is set. The shape of the dishonorable forms the characteristic O-shaped stain, so often seen upon desks and documents.