The Luna Concrete iPhone Skin from Posh Craft protects your iPhone by encasing it within concrete. This is not a gag. They don’t take your sleek and beautiful iPhone and dip it into freshly poured concrete. But it is a real slab of concrete that is thin enough to make the cover just as light as any other iPhone cover. The best part is that the concrete slab is made to look like the pockmarked lunar surface.