Ah, the trusty beer koozie (a.k.a. beer cooler, can hugger, coolie). Almost every beer lover has several stashed away in a drawer, holding memories of past beer fests, favorite brands or beercation destinations.

You might think it’s there to protect your hands from being uncomfortably cold. Perhaps you see it as a way to stop the heat in your hands from warming up the beer. Or maybe you use it to keep a slippery beer can in place when water drops accumulate on the surface.

However, those drops actually have a much more sinister effect.

Believe it or not, those very drops can push your beer’s temperature to the point that it no longer tastes how the brewer intended. Yes, you read that correctly. Despite beer having a makeup of roughly 95 percent water, a few seemingly innocent drops are Summertime Public Enemy No. 1.