13yo DS won't wear his helmet - or if I force him he takes it off when out of sight. A new one with a fancy light hasn't persuaded otherwise . It doesn't help he's with friends who don't wear one either. I know they think "they're safe" or it's not cool or god forbid ruins their hairstyle...but I want him to be safe when out. They do stick to cycle paths as much as possible. Anyone successfully managed to convince their teen successfully to wear a helmet without negatively? Looking for some non confrontational ideas.