I had a hard time finding a helmet that fit my head shape (roundish rather than ovalish). Finally found one when was in the UK a couple of years ago. Schuberth C3. Very light, very quiet (especially for a flip front), and very well ventilated. Also very expensive. Ended up ordering one from Germany (Schuberth was not selling in the US at that point). They are now sold in the US but the US Schuberth will not service an European helmet so when the chin curtain holders broke had to send to the dealer in Germany to get fixed. Was not a good experience but has held up since quite nicely. Worst part of the whole thing is that it is grossly expensive, even for a very good helmet. But am old and brittle and don't bounce as well as I used to so just gritted my teeth and bought it. If I hadn't would have probably wasted the money on cigars and scotch.

Long time observer of the human condition.