Millions of kids are putting their lives at risk by not wearing a cycle helmet, according to a report.
A survey of 8,000 primary school pupils revealed that two out of three of them snub helmets because they don't look cool, are expensive or uncomfortable.
This was despite two thirds of the kids admitting to having been involved in an accident. Most were not wearing hats.
Around 2,000 children are hurt in cycling accidents every year.
A new campaign is urging kids to better protect themselves and not put their image before their safety.
It also wants the government to change the law so that in the future you'll have to wear a helmet while cycling.