I bought 2 in navy for casement windows that I found impossible to dress until now.   The navy is absolutely blackout which is what I wanted.   The fabric is a satin polyester that is better than I expected.   The curtains are well made, although I cut  and reseamed the top to make them fit the window.  I also found it necessary to use a thumb tack on the side because the curtains pull to the center of the window.   The price was great and this is a definite 5 star purchase.