I ordered the liners for my guest room and hung them on the inside of semi sheer lacy curtains. They are exactly what I needed - the room is now so dark, even in broad daylight - perfect for a nap. Such a great value - I'd been looking at black out curtains and am very pleased that I could keep my existing curtains, but get the results I needed.  The liners are very easy to attach (little hooks that adhere to the rod pocket, and are not visible from the room. I've already recommended the liners to my daughter - an  excellent product and value.