As we all then learned in physics class, warm air rises and cold air from falls, insofar as the insulating effect already works a little better in cold drinks, because the cold by the double insulation downwards and to the sides is much better shielded and the drink of the ambient air may not be quite as simple as warming up, eg. a conventional glass
The advantages of the cup I personally but elsewhere: With approximately 160 grams, it is not half as hard as an ordinary coffee cup is easy to clean and also absolutely unbreakable. In addition, you can get your hands warm by isolating himself with a freshly brewed drink from the cup, without burning the same fingers. Basically therefore the perfect companion for construction sites, camping, fishing, etc.
The handle is for my taste a little too thin and round, in order to keep him comfortably, but the fact that the outer wall of the cup itself never gets really hot, it is more convenient anyway, just to take the whole cup into his hand.
The plate is quite thin walls, but nevertheless makes a solid impression and is processed completely clean and free of burrs, so you do not run the risk somewhere aufzuritzen lips. If in such an article but an absolute 'no-go.
Anyway, I'm quite satisfied with the cup and when, as mentioned at the beginning, no wonder with regard to the insulating effect expected, you get a strong, lightweight and visually appealing cup.