In 2013, researchers at the University of Washington set out to accomplish a very scientific task: to see if can koozies really do keep our drinks cold. The project, which was eventually funded by the National Science Foundation and the National Center for Atmospheric Research, proved what canned beverage lovers knew all along. We were absolutely right. It does keep canned drinks cold, mostly because the material in the koozie stops condensation forming on the outside of the can, preventing drinks from sweating away their chill.