The 300 Club is the name given to those 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. Those taking part 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 Geographic South Pole, running around it in the −100°F weather. After this, they usually warm themselves back in the sauna again, often with the aid of alcoholic beverages.
There are several patches made to commemorate the occasion that are entitled to be worn by those who have joined the 300 Club.