Twin brothers are climbing a mountain in the Himalayas, one dressed in modern clothing, the other in a replica of the outfit and kit used by British explorers George Mallory and Andrew Comyn Sandy Irvine about 100 years ago.
Hugo and Ross Turner, from Christow, Devon, have taken part in a number of extreme adventures before with their latest adventure testing how their bodies and clothing compares in the extreme environment.
The pair will climb Mera Peak, in Nepal, over a three-week period.