There's been a lot of talk around the net recently about the Incipio Feather case for the iPhone 6. It's lightweight, priced reasonably, and available in eight different colors. It's a perfectly nice iPhone 6 case, but it's certainly not the thinnest case around. On Incipio's site, the Feather case is listed as 1.524mm thick. That's certainly nothing to scoff at, but if you're looking for the absolute thinnest iPhone cases, there are plenty of options that are a fraction of the Incipio Feather's thickness.