Haven't tried it on anything cold as I bought it as a travel coffee mug. People talk about 4 hours plus hot coffee retention. I did not find it. After 2 hours it was still hot enough to drink but I wouldn't call it hot at all. After 2 hours it was still hot enough to drink but I wouldn't call it hot at all. After 2 hours and 10 minutes it was 118 degrees. It's not hot. Other than that, I really like the mug and the fact that the lid is easy to open. The device is beautiful, I am more or less satisfied with it. Would I buy this again, no I think I'd try a different one just to see if it would be better. Was it worth the money I think. TO EDIT. I was just taking the temperature of my coffee when you first poured it. That's very low. Only one hundred and thirty degrees. I probably should have done this first before writing my review as it changes my feelings. This mug only dropped 12 degrees in 2 hours and 12 minutes, which is actually not that bad. And now I've changed my mind, I'll definitely be buying another one of these. Sorry for the confusion but I want you to know the facts. I did a little experiment. I filled the cup three-quarters full with crushed ice and left it. After 36 hours there was still a scoop of ice cream in the cup. It's pretty impressive
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