Originally Posted by SuperDave

Plan on the helmet hair. A helmet that fits you perfectly at every point of contact is gonna do that, and this is what you want. This isn't a Geico commercial. Comfort (to me) is everything. Adjustability is optional depending on fit; at the age of 52 my head ain't gonna change any more. For me, that's a Giro Xen - I prefer visored helmets - but generally Giros and Bells fit me nicely, so I know nothing about anyone else's lids because I stick with what works. I paid $70 for my Giro, but only because I liked the white camo scheme better than the (much cheaper) previous year's available units when it came time to do another one. Either way, I only remember I have a helmet on when I'm riding into the sun and the visor hooks me up.

As an aside, do certain manufacturers produce fits better-suited to certain head shapes, like some motorcycle helmet manufacturers?