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Koozies are used to insulate a chilled beverage from warming by conduction and heat radiation, like a hand, warm air, or sunlight. Using a koozie can reduce the rate a drink warms in the sun by up to 50%. Secondary uses include easily identifying one's beverage from another person's and for marketing. By imprinting on the koozie you can use the koozie as a promotional giveaway because it is not only inexpensive to manufacture, but its frequent use is more likely to bring the company's name to a household presence.