Paper Bowl coat comes in two forms: a straight-jacket and insulating jacket. Straight-jacket: the jacket layer wrapped in white paper bowls outside, no gap between Bowl and coat. Insulating coat: coats leave space between the layer and the inner Bowl, coat the bottom end of the volume, more so than straight anti-scalding. Coat paper bowls (two-layer paper Bowl) is used to hot food (noodles ... And so on).