I started out with a few pairs of the Salomon 3D fast-packers, but they don't seem to make them anymore, or this is just the next generation in that price point, but anyway, great out of the box boot. Wore the GTX's for about nine hours before getting them on the actual "trail" . . . Just came off the "Cirque Section" of the Sierra High Route and the boots not only gave me no problems, fit-wise, or blisters, but they gave me a lot of confidence in their ability to stick to the many steep granite slabs I had to run up and knife-edged boulders I had to step across.