It uses the nomenclature from brochures etc. Trifolds have two folds but 3 panels.

Are you a vampire?

I use a Joeveo Temperfect travel mug. It has a special wax material sealed inside. When you put hot coffee in the wax melts, absorbing heat and reducing the temperature to a drinkable level immediately. Then, over time the wax releases heat as it solidifies, keeping the coffee at the perfect temperature. The only downside is cost and the fact that the mug is relatively heavy. Joeveo