it’s one of those things where some people feel the data is ambiguous. narwalt’s post is a good summary. my read has always been, kids should definitely wear them; adults for regular riding seems a toss up to me. ( racing or mountain biking is probably different )
some people feel they need all this gear to go riding, and that keeps them from getting on a bike. in my opinion, all you need is the bike; being active, riding rather than driving, is going to be the healthiest over all
