Bell Furio. I have a big round head. It's almost as wide as it is long. The Furio has lots of vents and is pretty lightweight. Dh's Bell Metropolis is a bit heavier than my Furio. I borrowed it once and my neck hurt after. DD has a similar shaped head as me and wears a Bell. DS's head is quite a bit longer than it is wide and he wears a Giro.