A double wall paper cup is a specially designed paper cup that consists of a paper cup and an outer patch. This structure gives double wall paper cups better performance in terms of heat retention and insulation. Double wall paper cups are usually used for serving hot beverages such as coffee, tea, hot chocolate, etc. Due to the formation of an insulating layer between the outer layer of the paper cup and the air layer, it makes the temperature of the outer layer relatively low and does not make the hand feel overheated, providing a better gripping and using experience. The inner cardboard layer is treated with a waterproof coating to prevent hot beverages from penetrating the outer layer of the paper cup. The double wall paper cup design effectively isolates heat and prevents scalding, and keeps hot beverages warm for longer.