How Beer Sleeves Keep Your Drink Cooler, According To Science - Tasting Table
Briefly

Beer koozies are essential for keeping your drink at optimal temperatures. They insulate beer from external warmth and the heat from your hand, preventing off-flavors that arise from temperature changes. The ideal drinking temperature ranges vary for different types of beer; for instance, light beers should be around 38 to 45 degrees Fahrenheit, while stouts and IPAs are best enjoyed between 45 and 55 degrees. Koozies not only keep drinks cool but also minimize condensation that can contribute to warming.
The optimal temperature for drinking beers varies, with light beers enjoyed at 38 to 45 degrees, while stouts and IPAs are best between 45 and 55 degrees.
Koozies work by insulating beer against outside temperatures and your hand, preventing unpleasant warmth and condensation that can alter beer's flavor.
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