Watch a report by ITV News Anglia's Russell Hookey
Reilly Stancombe from Clacton-on-Sea in Essex has had his first haircut at the age of nine. At more than 2 feet long, his hair was longer than his sister's.
Today though it all came off to help children with cancer and other conditions which cause hair loss.
While being treated at Great Ormond Street Hospital in London, Reilly met youngsters being helped by the Princess Trust.
Reilly is donating his hair to the trust so wigs can be made for those who don’t have their own.
His mum, Daisy Canny said: "It started off when he was younger - he just started to grow it. I had a cousin with long hair."
It from the Gareth Bale man bun to the David Beckham "curtains look".
Reilly's long hair might be just a memory now but his generosity has inspired donations of more than £3,000 pounds so far for the trust.