This has to start with the history of the two of them. Needless to say, the chef is the originator of the thermos cup. Since the brand "Chef" entered Japan, Japan has been researching and developing German insulation technology. Similar to the situation of Volkswagen in China. While producing and selling authentic chefs, the Japanese developed elephant seal and tiger brands by using the technology they learned. Speaking of which, I should have a little judgment in my heart. But I really want to say which is good and which is not, just like saying which is better, FAW-Volkswagen and Shanghai Volkswagen? Different people have different opinions.