I normally wear a 12, and ended up settling on a 13 in these. I wore them inside for two days to make sure I wanted them, then the first time I wore them outside, I mowed a .5 acre lawn. That as all the break in needed. My first hike with them was a one day round trip on the Black Mountain Crest Trail. Its a 12 mile trail that starts at 3000' +/-, and climbs up to a little over 6000' in the first three miles, then goes up and down over another seven 6000' peaks in North Carolina, ending ontop of Mount Mitchell, the highest point east of the Mississippi. The trail is rugged with no switchbacks, its either going straight up or straight down. I did it up and back in a day, 24 miles in basically new boots with Smartwool socks. My heel was locked into the heel cup, the toe box is kinda pointy, which I think contributes to needing to buy a size larger boot, but has plenty of room for your digits once fit, and the eVent lining breathed well, keeping my somewhat sweaty feet fairly dry. My only complaint is the other Kayland boots I've tried dont compare to this model at all.