First point, no matter how good looking or how much you want a helmet, unless it fits it is pretty useless.
Having previously had GIRO ski and bike helmets, I know I have a GIRO shaped head. The innovation of this model is the clam shell design which grips the entire rear of your head, rather than just the nape of the neck, as is the case with most retention systems. This makes it both very secure and comfortable.
Highly recommended if it fits you.