There are a few ways to tell if Oakley's Holbrooks are fake. One way is to check the lens quality. If the lenses are not clear and have a yellow tint, they are likely fake. You can also check the etching on the side of the lenses. If it is not smooth and consistent, then they are likely fake. Finally, you can check the packaging. It is expected fake if it is not labeled with the Oakley logo.