Superb product! Often I will stop to buy an iced coffee around 4PM after work. I put my Java Sok on it and put it in the refrigerator. At 8AM, there is still ice in my drink! I take it to work and often don't get to drink it fast, since we are masked and I am a teacher. At 10AM, there are still a few ice cubes floating in there and it's still plenty cold. WOWZA! I bought my husband an iced coffee last week to see what would happen with and without the Java Sok. His ice was completely melted in the refrigerator by 8PM, only 4 hours after putting his iced coffee in the refrigerator....mine lasted til 8AM and then another 2 hours out of the fridge! That's amazing! Of course, it is terrific at ******* up the, used to be, sopping puddle beneath the iced coffee, too. I have bought 3 for friends, 1 for my husband, and 3 for myself since I found out about these things a month ago! Java Sok for the win!