In reply to AlanLittle:
I disagree on a couple of points.
Shoe sizing is supposed to be a standard measure, it is unregulated and so beers away greatly. Great bit of autocorrect there.
Shoe size is foot size, you put your foot in a device and it reveals a number. The numbered foot is placed into a numbered shoe which should fit.
Hats off to Ocun. Street size and rock shoe size perfectly matched. Scarpa, less so.