What is an insulated cup?

Insulated, or double wall containers are essentially just that; a container with two layers that is keeping drinks cold only by added material in the form of an additional wall.

A reusable travel mug is an insulated drinks container that's designed for use on the go. Most come with leak-proof lids that screw-on or push-on, and some have with handles. The best travel mugs are made from double-walled stainless steel that keeps drinks hot or cold for hours.