I love double walled glasses and use them exclusively for our coffee. These are too big for coffee (at least espresso coffee anyway) but I love to use them for tea, hot chocolate and milkshakes. They keep the drink hot/cold for way longer. These can also go into the dishwasher unlike some other brands, which was a huge selling point for me. 
Shipped in a large box with lots of padding too, they clearly know how to ensure it arrived safe!