I was very skeptical at first when I purchased my Frost Buddy. I have several other containers all saying they keep your beverage cold or hot for hours, and don’t. Well I can honestly say that this Frost Buddy does exactly what it says it will do. I purchased a Trenta cold brew and left it in my hot car several different times one day, and every time I came back to my car the beverage was still cold and still had plenty of ice. I actually think my drink got colder the longer it sat in the Frost Buddy. I think I will be purchasing a couple more of these for all of my beverage needs.