The world’s most famous climber reveals the gadgets he takes with him on his adventures

We often talk about wearable technology in the context of the best running watches or the best sleep trackers, but which gadgets are helping the mountain climbers of the world?

The popularity of rock climbing and its sister sport, bouldering, has soared in recent years, thanks in no small part to the success of Nat Geo’s Oscar-winning climbing documentary. Free Solo. At the center of this heartbreaking film is Alex Honnold, a now 38-year-old climber who in 2017 became the first person to successfully climb California’s legendary El Capitan rock face without ropes.