Review (4/5): Great Insulation!
This is by far one of the best insulated tumblers I have ever owned. I have hat hot coffee in it now for about 3 hours and it is still "sip" hot. The outside of the container is cool to the touch. Absolutely no heat transfer that I can tell. My only complaint is the tops. I would have liked to see one that is somewhat seal-able. I have to take a star off for that but otherwise it is great.