Giorgio Brutini overalls are LARGE, at least 1/2 size to 1 full size. I have 5 different styles and they are all large. This pair was returned due to a large crease in the upper of the shoe. not portable. I'm a size 12, but I'll buy a size 11. You don't wear thick socks with this shoe, so get the small ones. For your health. JayJay