I normally wear an 11 or 11.5.  11 for a sport shoe that I want to fit snug enough to provide foot support.  11.5 usually for more casual wear.  I read the reviews and saw they tended to run about 1/2 size large.  I bought these intially in size 11 and then tried a 10.5.  I have a thin foot.  I like the shoe in general but it just didn't fit my foot in a size 11 without a hiking sock.  Just a little to long and loose to provide any real support.  I really don't want a pair of hiking shoes that won't fit with a lightweight sock.  So, these shoes would be great for someone with a mid to large volume foot.  Just didn't work for me.