These run large! EU sizing is going to be most accurate though.
I'm normally an 11.5-12 in US men's sizing. I ordered a 44.5 EU (which is evidently an 11 US men's) and they fit just right. I know Paraboot stuff is generally supposed to run large, and from my experience I can say it's by about a half size.
These are really lovely and well made, very happy with the purchase. Todd Snyder was quick to ship and once I received the notification I got them next day.
Very pleased with the overall experience!