You'd never leave this folding bike helmet behind

If you love cycling within city limits, a helmet is a must. But even with our lifelong fear of rash drivers on the streets, we sometimes leave the helmet at home. With the Fuga helmet, you can now have the best of both worlds.

A folding bike helmet is not a radically new idea. But making one that's simple (and would actually protect your skull) is a challenge that has eluded engineers thus far. At first glance, though, the Fuga helmet seems to tick most of the boxes.

The helmet is made of three circular shell components, which fold down and nest inside each other to make a package that fits inside a bag.

According to manufacturer Closca, the helmet has passed certifications in Europe, Canada and the United States, thanks to a combination of polystyrene and polycarbonate in the shell.