During each winter at the Amundsen-Scott South Pole Station the outside air temperature falls to extremely low values. Usually the temperature will fall below minus 100 degrees Fahrenheit on several days during mid-winter. The residents of the Pole Station have established a custom: on the first occasion when the temperature falls to -100 degree F, all the members of the crew report to the sauna which is turned up to 200 degrees F. After roasting in the sauna for awhile, each runs outside wearing only a pair of boots, and in so doing undergoes a temperature change of 300 degrees Fahrenheit without the benefit of clothing: the 300 Club !

As one who has done it, I can say that it certainly is a refreshing experience.