Thermal Mugs

thermal
An upward current of warm air, used by gliders, balloons, and birds to gain height
A thermal garment, esp. underwear
rising current of warm air
relating to or associated with heat; "thermal movements of molecules"; "thermal capacity"; "thermic energy"; "the caloric effect of sunlight"
of or relating to a hot spring; "thermal water"

mugs
A large cup, typically cylindrical and with a handle and used without a saucer
A person's face
(mug) the quantity that can be held in a mug
(mug) rob at gunpoint or with the threat of violence; "I was mugged in the streets of New York last night"
(mug) chump: a person who is gullible and easy to take advantage of
The contents of such a cup