Love these!  Definitely "extreme" blackout curtains.  Very heavy, nice material.  I put them in my bedroom to replace a pair of what I THOUGHT were blackout curtains.  I can't believe how much light my old ones let in! The only reason I didn't give 5 stars is because there were a few stray threads I had to cut and they seem to be a little shorter than 84".  Will definitely buy these again.