Letter under the shell of 900's and 950's

[Whitey]

Hello all,

Northwave 900's and 950's have some capital letter under the black sole of the shell. In my boots, the letter is 'D'. Does it refer to shell size or something else?

Thanx,
Kari

[Hans]

yes it's the mondo, only i do not know which one. I had b/c, something around 27 mondo