They are sheer with the sun coming through but they are listed as Semi-Sheer so no surprise there.  I wasn't looking for black out curtains.  The color was exactly as pictured.  I was actually surprised!  I ordered the Navy and they are stunning!  Really gives the room an added pop without going overboard.  Going to order another set just to make the overall look of the curtains fuller.  Extremely happy!  I paired it with a Wayfair Navy Shag Rug and it looks like a new room!  Everything I wanted!