These curtains are good quality, but they are far from blackout, even with a secondary honeycomb shade in back of them.  I've ordered and returned other blackout curtains from another site, and those weren't blackout either.  I'm guessing that most, if not all, of Wayfair's "blackout" curtains are not blackout, as they appear to be of similar manufacture to these.  I think a liner is really needed for true blackout curtains.  Anything else should not be advertised as blackout.