Just purchased my third pair.  I wear 10 or 10.5 in most shoes, and EU 43 in this sandal fits perfect.  Just one little warning, I did some work in the yard in these sandals, working on the sprinkler, and I got some rough sandy soil under the ball of my foot. Instead of cleaning the shoe out immediately, I walked around some. This tore the leather. The sandals are still usable, just a little less comfortable.