Marked a size 9.5, but they fit MUCH bigger than that. I had my sister who wears a size 11 D try them on, and they fit her. A tape measure with the end pushed against the inside of the toe measures about 10.5" at the back of the foot bed (see the last picture).

These are the women's version- they are stamped with the women's style number. Maybe they were professionally stretched. I don't know, I bought them second hand.