Just thought I would throw it out there. I am shocked as I usually don't try shoes on. I have been a 10 1/2 since 8th grade and I'm 40 now.
I went to buy the smaller pair for wet wading with the thin neoprene Simms gravel guard socks. My Simms guide boots that I wear with waders and fit great are a size 12
Simms Rivertek's BOA , I got a 10.... I am shocked
Moral of the story, try stuff on