STARTING ABOVE THE HIGHEST PEAK in the Canadian Rockies, two strangers completed a revolutionary paragliding journey to the US border, and redefined the standards for how the sport is measured.

“35 days just being radical, in the mountains… it was amazing” says Gavin McClurg, who joined climber and kayaker Will Gadd to make the 400-mile traverse down the Rockies’ spine.

The sport of voly biv originated in France. Basically, you fly around in the sky, chasing thermals to propel yourself up and forward, and land in high places so you can take off easily the next day and fly even further.

Using thermals to soar like golden eagles, camping from peak to peak… it sounds unreal.

“It’s been months and my blood pressure still elevates [when] thinking about it,” Gadd told National Geographic.