Cost-cutting. The Mazda6 sedans assembled in Japan have them. But the N. American hatch and wagon have headrests so they'll soon put them on the sedan (probably at the '06 refresh).Zoom Zoom Zoom said:How come the hatchback has rear headrest while the sedan has no rear seat head rest? Any reason why Mazda would choose not to have rear seat head rest in the sedan? The only possible reason I could think of would be visiblity, but I don't think it would make a huge difference.