They definitely keep my coffee hotter longer than a ceramic mug. They don't perform as well as the Yeti Rambler, but they look better in my opinion. Also, I got two of these for the price of one, so I think they're good value for money. As a last resort, you can always put a ceramic mug in the microwave for a quick reheat, which you can't do with these. Also, it won't be my first choice for a travel mug. But for the purpose I bought them for, they work well. All you have to do is make the choice that best suits your needs.
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