Looking at the REI illustration, one can see that there are cooling vents in the top of the helmet. They make perfect sense on a bike helmet, but are not optimum when you might deal with falling objects.

Cream is a decent color. I commuted regularly by bike for many years and i became a firm believer in bright clothing for the cyclist.

Of course, when an EQ strikes, how likely are you to have a helmet handy. It will be critical during the aftermath and during cleanup. Lots of potential hazards there....