Bought these for Mount Whitney to be honest I was ill prepared and blessed with these boots. I put them on the day before the walk and made sure they fit well, and took them off again after 10 minutes. The next time I wore them with thick wool socks was at 3am on a hike. They rocked all the way, others complained their legs were sore and sore after 6-10 hours, they kept them comfortable throughout the hike! We started at 4am and ended at 8:30pm. We didn't do anything all day except pull them a little tighter. I highly recommend it.