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It's just a coffee mug.
It doesn't keep my coffee hot for as long as my old mug did by a long shot, but I generally drink fast so that's not an issue. The lid is just an opening so spilling might be an issue. It does fit better in my cup holder which is actually a big deal so big points there. It's a coffee mug. Just buy it. lol
Nice appearance. Buthot coffee looses its heat as it is conducted away. Perhaps good for warming hands as the mug temperature increases. Maybe my double-walled mug is just defective? Dunno.
Thank you for your feedback on the Miir Tumbler, we are sorry to hear about the product issue. With the Tumbler, if it is cold with when the hot beverage goes in, it will certainly impact the temperature. During the colder mornings, it is good to rinse it with a little hot water first before filling it. If you find that does not work you are of course always welcome to [return](https://www.patagonia.com/returns.html) any item that does not work out for you.
A fantastic tumbler!
I'm a fan of Miir and own several of their tumblers, camp cups and other gear. This one is beautifully made, with a color that matches Patagonia's New Navy (which is my favorite). The logo looks fantastic, and it will probably be my only Miir cup that isn't covered with stickers :-)
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