Provides a handle: (i) for grasping, and (ii) provides a gelid circumference of the mug that is insulated from the hot fluent by distance.
The mug stores some hot spell from the beverage, and so prevents it from cooling too quickly
. The constitution of a mug helps insulation: (i) thick walls detached the beverage from the chilly external air, and (ii) an indented dishonorable separates the beverage from the surface upon which the mug is set. The shape of the humble forms the characteristic O-shaped stain, Visit so often seen upon desks and documents.