It really works like they claim!
I’m really loving the insulated tumbler! I use it mostly for Moscow Mules while camping. Recently the dog had to go out and I forgot my Mule until the morning. When I took the lid off, I still had ice in my cup. And another time I made hot tea and it was too hot to drink so I took it with me. It was a couple hours later when I tried another sip and it was STILL too hot to drink. So the cup is very, very well insulated. Love it!!