If you spend enough time running long distances off-road in vast trail systems, you'll inevitably end up on a trail called 19. By then, you'll be a fast moving, sinewy example of an evolved, efficient trail runner. You will have reached a trail runner's purgatory, experienced under the influence of endorphins. The Trail 19 is a sock that will take you there. We didn't set boundaries when we created the Trail 19. We used the best fiber available at every contact point. Trail 19 is built for mile after mile of dust, mud, arduous climbs, rocky descents and creek crossings.