For a lot of people – probably most – trail running involves getting off the asphalt. That usually means compacted dirt, crushed limestone, or woodchips, surfaces that offer a softer alternative to the pavement, but are typically no problem for traditional running shoes to handle. But then you have serious trail running, the kind you see in the ads for trail running shoes, with steep climbs, rocks, roots, and twisting trails. Here you'll definitely want some additional support and protection from obstacles on the ground. Columbia's Montrail Rogue FTK II is that trail running shoe for rugged mountain trails.