My boyfriend has been wearing these Quest 4D GTX boots while running pack trips (with horses) for the past few wet weeks in the Tetons and is the only one in the group who has had dry feet. He is a size 11 and the boots fit true to size. He also beats up gear and these have remained durable and reliable in mountain environments from early in the morning to late at night. He - Teton Outfitters - gives them a five stars. Wants to live in them for as long as possible.