Alex Honnold is the planet's most famous rock climber, known for scaling massive walls without ropes. He’s at the absolute peak of his abilities. So it would seem rather surprising that his go-to climbing partner is Cedar Wright, ten years his senior and often not in the best physical shape. Honnold calls him “the world’s weakest professional climber,” and he’s only half joking. Yet despite their differences, the two friends share a unique bond that has them calling on each other for support on particularly daring projects. To understand why, we mic’d them up for a 5,000-foot free-solo climb in Nevada’s Red Rock Canyon.

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