This may be a silly question and some may just shake their heads in dismay but I'm putting it out there anyhow. i'm looking to upgrade to a new helmet, i like the styling and profile of the giro eclipse(road helmet) but my buddy at the shop thinks i should get a mountain helmet( giro havoc), Question is, whats the difference in a road helmet and mountain, a visor, i ripped the one on my old helmet off, i felt it blocked my vision a little. so he says more coverage for the back of the head on the mountain helmets but i like the clean styling of the eclipse, does it even matter, also if anyone wishes to recommend a good xc helmet that would be cool. thanks