It's science Sunday. Coozie mission #1 is all good, concealment is key, and if you have one that fails at that it means it's time to put your mom's pantyhose back in the closet and get the real thing. Justifying 5 bucks? Easy. The stalwart scientific minds at the University of Washington produced a study that concludes that yes, coozies do in fact keep things cold....I studied science on the wrong coast. Not just a study folks, a published study. In Physics Today. Humidity is more of an issue than hot temperatures, it turns out, as the condensation on a can when it’s humid will release latent heat.
At 35 °C and a relative humidity greater than 60%, the temperature rise due to latent heating exceeds that due to heat transfer from dry air: Latent heating is the dominant factor warming your cold beer. The rate of latent heating decreases as the outside of the can warms, and the heating ceases completely once the can’s surface temperature exceeds the dew point (the temperature to which air with a given water-vapor content must be cooled to become saturated) and water no longer condenses on it.
It's the smart, stylish choice. -S