I ordered these more for insulation than for the blackout feature, but I am delighted at the almost total blackout these curtains provide. In addition, the curtains also provide more insulation than I expected. With back tabs as well as the traditional long pocket to slip over curtain rod, they were both versatile and easy to put up. The hang perfectly after placing them in a dryer with a most towel to remove the creases from packing. They slide easily on the curtain rod in my dining room and look really elegant tied back with the included tiebacks over the large picture window in my living room. I'm very impressed and plan to purchase more for our bedrooms.