I used these in my son’s nursery. The arrow pattern went perfectly with the outdoors adventure theme of the room. They are not completely blackout, as when the sun is on that side of the house, it would get bright in there. We ended up taping black contractor trash bags to the windows over the shutters to create true blackout. They did do a good job when it came to thermal protection and fighting the heat of the sun. All in all they are good quality, but you will need to put something underneath them if you’re looking for blocking all sunlight.