Is this mug in between letting the coffee cool immediately and insulating the coffee so well that it's not drinkable till hours later?
1039279
It definitely keeps it warm for awhile ... I would imagine if you left the flip top open it would cool faster.
1039280
Yes. It holds the heat well if you preheat the mug with hot water before you fill it with coffee.
1039281
This mug is not "super" efficient (a la a vacuum thermos) so the coffee cools in about the same time as a Styrofoam cup. What I find most useful is that I can pop this mug in the microwave because there are no metal parts and I like my coffee hot.
2068277
I always finish my coffee in less than 12-hours so I don't know for sure if that claim is true. I do know that when I pour a cup of coffee at 8:00 am (with the bottle kept indoors at room temperature) that, although my coffee is not as hot as when it was poured, it is still hot at 4:00 pm.
2192301
I like my coffee hot so after brewing I put the mug in the microwave for 40 seconds and it's fine. have not tried it for the full 2minutes to boil cold water.
235808
It is make of plastic so, no it is not insulated. The beverages stay cold for a time but not like a thermos or stainless steel that is double walled.
1779000
Keeps coffee hot-really hot for about 5 hours before it starts to cool down.
192465
Not really. It's just designed to keep hot stuff cooling down slower. It might heat cold water in an hour or so but not hot enough to make tea and that amount of time could damage the mug.
969676
Not at all. Even when I keep mine in the ref overnight, it never sweats. I am so very happy with these mugs.
3099
Yes! As a matter of fact, I am drinking my second cup right now, 30 minutes after making the coffee. It's hot! The warmer goes off automatically after one hour.
1298674
Your coffee machine must brew cold coffee. If I don't open the lid, my coffee is still scalding hot after at least 2-3 hours. Locking is not necessary. Or you might have a defective mug.
504644
After preheating the thermos I put hot coffee in it in the morning. I don't usuLly drink it all. The next day when I clean it out for the next batch the leftover coffee it's still warm.
1607262
Yes, and really keeps it hot.....at least 5 hours later it is still almost to hot to drink. Just leave the lid off for 10 minutes to let it cool.
1483435
No-the coffee is in a thermal carafe. You put the lid on the carafe and it keeps the coffee very hot
2209965
I think it is some if the chemical gel used to insulate the mugs. It is filled between the inner and outer layers of the mug, and sealed at the bottom. Don't use them.
1696636
...the coffee MAY stay hot...but I wouldn't know since the handle is a heat sink, therefore it's impossible to hold UNTIL the coffee cools down. I do not advise the use of this cup for hot beverages.
381258
Yes. It's almost too hot to handle after being washed with hot water let alone filled with piping hot coffee. It isn't insulated.
2023696
Absolutely! In addition, Ivuse this mug for coffee straight from the coffee maker. I also put it in the microwave for 45 seconds to reheat the coffee; the mug remains cool to the touch.
289602
The lid is a press - not insulated, but I doubt it would be worthwhile for it to be insulated. This is not a thermos, but a French press that does a pretty good job keeping coffee hot for longer than a glass carafe would. Use a tea cozy or put the coffee in a real thermos if you want long term heat retention. And....it won't break - a real plus.