When I was waiting for my bike to be delievered, I bought a wonderful shiny blue Giro to match my bike, but never used it. I never even took it out of the box, because I decided my main concerns were visibility and lots and lots of holes, for airflow, and my pretty blue didn't have enough holes to suit me, and I wasn't so sure about the visibility.

I ended up with a flat white Giro that is actually made for mountain biking (or so I was told) because in my price range, it had the most holes.

I've since considered getting a bright yellow like Lisa SH and may yet -- but it will have to have LOTS of air flow. My head gets way hot in the Texas heat; I can hardly bear to wear a cap or hat of any kind. When I take it off, my head is as drenched as if somebody had dumped a bucket of steaming hot water over me.