well my guess is that you have a HUGE foot!!!!!!!!!!
N in shoe size stands for Narrow.
One Size
M means medium, and is a reference to the width of the shoe, not the actual size.
A shoe size of 13 in America is an average size for a man. Women's shoe size average is a 7. No hidden meanings. That is all it means.
Small.
in shoe size
size 12 1/2
3M in U.S. shoe size is very simple. It means three medium. This shoe size is very small, especially for women.
a double size
girls size
a double size
Nothing at all. It's just a size.