The difference between a single-walled and a double-walled paper cup is the extra paper layer on the double-walled cup. This extra layer has the purpose of keeping coffee or tea more effectively warm. At the same time, a higher carrying comfort is ensured with the double-walled cups since the air between the layers cools down the external surface of the cup and hence protects your hands from burning. The additional layer ensures comfortable carrying without the need for sleeves.
Other available sizes/colours: