I bought these, in navy, for a massage room. They go along one wall (no windows) covering our extra pillows that hang from clips on the wall. I bought them for their color and the grommet top for easy sliding back and forth, not for the blackout aspect, per se. Plus the price was right. Well, the blackout feature has resulted in some much-needed sound-proofing (weight room on other side of curtained wall). Even better, these are beautiful, wrinkle resistant, machine-washable. The material is such that I can tell it'd be resistant to dog hair. Not an issue here at work, but at home that and the other features mentioned would be perfect. So I'm considering buying them for my home for to cover windows for the blackout and insulation features as well. Lastly, they get many compliments from clients. So I give these my highest recommendation. The shipping was super-fast too.