I wear an XD-3 and the shape of the C3 is no problem for me. Also the Nolan's are a bit round for me, but I think the C3 is the happy medium between round and intermediate oval.
If you can fit anf XD-3 and something like an RF-1100 you should be fine in the C3.
As I said to Jim above, the only head shape so far thathas not worked is the long long oval (profile shape). I have yet to get it on someone with super-round shape yet, though.
Originally Posted by Boondox
Both my Arai XD3 and my now disintegrating Nolan N103 fit me well. Does that mean the C3 won't..?