This is hands down the best thermos/travel mug EVER! I have three of them and have bought several others as gifts.
There’s also a model with a build-in tea infuser, but I prefer to brew my tea separately. It comes in plum, teal, and silver (the one with the tea infuser is only available in silver).
It truly lives up to its claim of keeping beverages hot for 12 hours. When I make my bedtime tea, I often brew a second mug for the next morning and its still scalding hot (the fuller the mug, the longer it keeps hot).
It’s pretty much spill-proof – as long as the lid is closed! But you can pop it open with one hand – just push the button. And closing it is pretty easy, too.
Finally, the “flow control” feature also works as advertised. I rarely get a faceful of scalding tea with this mug.
My only complaint is that the small “handle” or tab on the back (so you can clip it to a bag/backpack) breaks easily.