The outer layer is made of brown kraft paper. It has a certain thickness and toughness. The inner coating is made of food-grade PE. It can efficiently prevent coffee form leaking and has good waterproof performance, ensuring that the cup will not become soft and damaged due to the penetration of coffee during use. It adopts a double-layer design. There is a certain gap between two layers, which makes the cup has heat insulation. And it is available in multiple specification and can be customized according to needs.