The mountains are calling. Sure, those in North America are increasingly bereft of snow, but running their trails doles out pain and beauty akin to the sufferfest of earning your turns. And ski companies know it. From Salomon to Patagonia, ski gear companies put out a range of trail running shoes. We tested a bevy—in mud, on gravel, through snow, on boulders, and in creeks. Here are some of the best.