Great Insulating Properties, a Little "Fat"
My 16oz tumbler kept my tea warm for hours, it's great. However, for me the cup is a little "fat" at the top. Personally, I would prefer a taller, skinnier cup (maybe 6" tall like the Copco 16oz cup) which would be easier and safer to handle when driving.
Pirani Life
Scott, Thank you for the thoughtful review! We’re glad your tea stayed warm for hours. We also appreciate the feedback on the shape and the idea of a slimmer option for driving, and we’ve passed it along to our team. Cheers, Pirani Life Team