> Having mosquitoes or flies clouds was a common occurrence on the road and the best motivator to wear a helmet for a youngster not bothered by security.

Debatable. In The Netherlands, except for professional cyclers people who drive bicycles generally don't wear helmets. If they'd do, they'd look like profs and then cars keep less distance, which is an increased danger. A cap and glasses works fine for me with regards to sun and getting things in my eyes (sand is still annoying at times), just don't drive with your mouth open.