Wim Hof is commonly nicknamed Iceman. He holds nine world records including a world record for longest ice bath. In 2007, he attempted, but failed, to climb Mount Everest wearing nothing but shorts. He plans another attempt in 2008. He broke his previous world record by staying for 1 hour and 12 minutes immersed in ice outside of the Rubin Museum of Art in New York City on Saturday January 26, 2008.
Scientists can't really explain it, but the 48-year-old Dutchman is able to withstand, and even thrive, in temperatures that could be fatal to the average person. 
On March 16, 2000, Wim Hof swam 57.5 m. (188.6 ft.) under three feet of an ice lake near the Finnish village of Kolari, deep inside the Arctic Circle. Using no special equipment, he wore only swim shorts and a pair of goggles. Just freezing.
12 marzo 2008
In January 2007, Wim Hof ran a half Marathon (21 km) above the polar circle in Finland. He wore only a pair of shorts and no shoes. The ground (snow) temperature was 35 below.