I was looking for a sturdy yet lightweight backpacking boot with great ankle support for a rocky trail to a backpacking destination in Montana's Crazy Mountains. The Chacos were lighter and more nimble than my regular Zamberlain backpackers, offered more ankle support, and best of all they fit beautifully right out of the box. I gave them one day-hike break-in, and was able to use them with absolute comfort while carrying a 25 pound pack over loose rock, and hilly and rocky terrain that climbed steadily for 4 miles, with some stream crossings (but not total immersion). I wear Lowa Renegade day-hikers and have always been thrilled with their comfort and durability, so I had high expectations. I am very impressed with the Chaco Beckwiths--great fit, easy break-in, terrific support while bearing weight over challenging terrain, terrific on descents, too. I plan to try them on snowshoeing expeditions in the mountains this winterbecause of their excellent mix of firm support and flex.