Simpson sold Simpson, started a new company, Impact. Not sure which company was recently in the news about the quality of their helmets vs actual testing. Something about putting approved stickers on helmets that weren't approved. I don't remember the details, so research it first to see what I recall is correct or not.
I had a chance to try a carbon fiber helmet at Putnam. More expensive than my head and light as a feather.
While not meant for a car, I have a kevlar kayak helmet. Literally saved my life. Lesson I learned, don't skimp on helmets.