Difference Between Yeti And Coozie

I was surprised that the Yeti and the coozie started off at different temperatures. It is surprising to me because I placed both bottles of water beside each other and in the refrigerator at the same time. I am surprised to see that the coozie took 23 hours to get to its highest temperature, I predicted that it would happen in three hours. I am also surprised that it only took a matter of minutes for the coozie to start warming up. I think that it is interesting that all of my comparisons between the Yeti and the coozie were true, but that the temperature difference was so close together at the end of the 24 hour period.