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The 300 Club is the name given to the group of persons who have endured a range of temperature of 300° Fahrenheit (166°C) within a very short time. The practice originated at Amundsen-Scott South Pole Station in Antarctica.
Participants in the 300 Club wait for a day when the temperature drops to −100°F (-73°C) for more than a few minutes, generally in the winter. The persons first warm up in a sauna heated to 200°F (93°C) for as long as 10 minutes. Then they run naked in the snow to the Ceremonial Pole itself in the −100-degree weather, and run around the Pole. After this, they usually warm themselves back in the sauna again, often with the aid of alcoholic drinks.
There are several patches made to commemorate the occasion that are entitled to be worn by persons who have joined the 300 Club.