Zojirushi has a coating, which is its patent, an advantage, and also a disadvantage in China, because we are more worried about the harmful substances produced by the coating. It is said that there is no problem, and Zojirushi is also very popular in Europe and the United States. Like, they have no shading on the coated stuff. I personally prefer Thermos, mainly because of its appearance, O(∩_∩)O~5719