Unlike a single-piece full-face helmet, a flip-front has a separate chin-bar that lifts up, exposing the face while the helmet is still on. Not only does this allow people to see your face for ID ...

Protecting the cranium is essential, and if you ride aggressive terrain, a full-face mountain bike helmet ... the Trajecta ...

But newer models are often indistinguishable from fixed, full face helmets, thanks to new lightweight materials and design. And of course, the view from inside is much the same as any helmet.