I usually wear a 9.5 in Merrells comfortably but the 10 in these boots fit so much better than the 9.5.  Very comfortable boots.  Wore them hiking for 6 miles on the first day and no blisters.  Hiked on a muddy and dusty trail and the boots look great with a quick brush off at the end of the day.  A light boot with sturdy ankle coverage (I am a notorious ankle roller and this kept me steady the whole time).  Very happy with my boots.