This is such a cute glass bottle for tea. Works just as you need it to and i know a few people who would love this.
However if you need this for keeping tea hot or to not be hot to the touch keep looking. The glass is is cute but doesn't keep it warm for longer than maybe an hour depending how hot you boil your water.
Overall I bought this for how it looks and the basic functionality of brewing tea for work. I definitely recommend as long as your standards is it's mainly for aesthetics rather than functionality other steel tumblers.