Reading peoples posts Stirling Glacial seemed to be one of if not the coldest. Tried it for the first time yesterday and while it was very cold, Not as cold as I was expecting. I've tried QCS Vostok, and Glacial. Glacial wins over Vostok for the colder of the two. Haven't tried Yeti snot. For those of you who have tried it which one is the coldest? If you think another is colder, let me know which one.