Like many cyclists, Jeff Woolf has been involved in a serious crash—one that might have killed him were it not for his helmet. So why, he wondered, do so many of his contemporaries refuse to wear one? Turns out, it’s mostly because they’re hard to carry around; they’re thick and bulky, and don’t fit into bags or backpacks. And that was a problem that Woolf, an engineer, knew he could fix. The result: Morpher, a bike helmet made from interweaved plastics that is just as strong as its traditional counterparts (it meets general safety requirements in both the U.S. and Europe), but flexible enough to fold almost totally flat, making it easier to transport. “It’s inevitable that as more people take to the road on a bicycle, more people will have accidents,” Woolf says, adding that he hopes Morpher will save lives.