 In 2007, Hof climbed to an altitude of on Mount Everest wearing nothing but shorts and shoes, but failed to reach the summit due to a recurring foot injury.In February 2009, Hof reached the top of Mount Kilimanjaro within two days wearing only shorts and shoes.In 2016 he reached Gilmans point on Kilimanjaro with journalist Scott Carney in 28 hours, an event later documented in the book "What Doesn't Kill Us".