This thermos really retains heat very long. ("Tip" or evidence: before putting your tea / coffee hot, leave 5 minutes of hot water in the thermos to pre-heat the internal walls)
Be careful though, if you put in the burning liquid, it will remain the same after one-half day. (I have not tested several days after, but frankly it would not surprise me ...).
Looking good, I had the Thermos brand cheap, and frankly I'm convinced enough to not even test the competition. (That said look good prices of the various official thermos, it can vary greatly from one article to another ...)
