When the time comes, I hope my plain WRSI is enough. Ouch. I know it's come in handy with preventing minor dings and rock clunking while upside down, but nothing major. I had a concussion when I was snowboarding at the age of 12. That was before you ever saw anyone with a helmet on groomers.
If my WRSI isn't enough though, I've considered upgrading to one of these
. Will need to outfit it with some good padding and possibly keep it waxed though.