This just in....Here is the response from Maplus in Italy (note it is from an Italian, typing in English):
"To confess you, it's the first time I receive a such kind of question !
In a first time I was tempted to answer you: sure ! It's possible that a head shape is fitted better than other. You know, the fitting sensation is clearly one of the most personal think !
Thinking better on the demand, I can just answer you that we know that our helmets wear very very well.
In the European market, and in Italy especially, we found out an initial difficulty to enter in the shop with our helmets due to the strong competition with the concurrents (Briko, Boeri, and all the others which are on the market !). But, when we convince a shop to buy our helmets and they try them, they buy more and more as they get a very good response from the customers and particularly for the fitting !!
Maybe the only common note of our helmets is that the helmets wear "little", and is closest fit to the Carrera. To better explain, if, for example, one person wear the size 56 in our Comp Sr helmet, he may find better fitting the size 58 of our S6 helmet (you know, that Comp and Rental helmets are made by a supplier who is different form the producer of the S, F and X helmets !)
I hope my explanations can help you.
Frankly, I don't know what more I can tell. Anyway, if you need any diferent info, let me know and I'll try to do better next time !!"
Any other questions to pass along that may help?
One additional note: as with many suppliers, Maplus works with helmet producers to design and fabricate their proprietary molds for their helmets styles and fit. Tools4Boards fabricates tools and vises for other global suppliers.