A marvellous invention that keeps liquids at their starting temperature for as long as possible. By means of an insulated cylinder, the liquid inside is buffered from the outside air, thus retaining its frosty cool or steamy heat.

Some insulated mugs are deceptively leaky, and can cause more harm than good. Always try out a new purchase before using it on the morning drive to work, unless you like being surprised by scalding coffee stains down your chest and over your crotch.