Maybe Harry twisted their arms.
The foudation controlled by William, Kate and Harry is donating £100,000 to Walking With The Wounded's 2013 South Pole Allied Challenge. Harry, the expedition patron, announced last month that he will join the gruelling 210-mile trek across Antarctica this winter.
Prince Harry, who is currently making injured troops the focus of his week-long US tour, will also join the soldiers as they trek in temperatures of minus 45C.
Chief Executive of trio’s Royal Foundation, Nick Booth, said: “The Duke and Duchess of Cambridge and Prince Harry are all dedicated to helping our wounded undertake truly great adventures and sporting achievements as part of their recovery. The Walking With The Wounded South Pole Allied Challenge is a perfect demonstration of the tenacity and resolution of the inspirational men and women who serve both our nation and our allies.”
Harry will join four British team members in November as they race against teams from the US and the Commonwealth. Harry announced his involvement at central London’s Mandarin Oriental Hotel last month in typically idiosyncratic style, saying to the US team: “As a member of the British team, I will have a brew on ready for you when you join us at the Pole.”