Hubby bought this tea tumbler for me for Christmas from Teavana, and it’s absolutely amazing. This tumbler holds about a cup and a half of tea. It’s stainless steel and the insulation is amazing. Today I made some tea and was rushing out the door. In my haste, I left the tumbler of tea behind. Three and a half hours later when I returned, it was still piping hot. I left it for another 1-1.5 hours and when I drank it then, it was still hot (but not burning hot). The website says that the the double-walled, vacuum-insulated tea tumbler will keep your favourite blend hot or cold for up to six hours. It easy to use and easy to clean. I love it!