Conducted an experiment, poured boiling water into this "thermo" mug and into the usual non-name thermomug. After 2 hours in Contigo the temperature was about 40 degrees. Noname showed 70 degrees. I also noticed that after pouring boiling water, the surface of the mug heats up noticeably, i. E. There is heat loss from the entire surface of the mug. Perhaps I got a marriage, I wrote about this to the manufacturer on the website, but received no answer. In any case, I can only use Contigo as a regular mug, hence the score.
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