I made drapes with a black out liner fabric. It felt very much like a rubberized fabric I've seen used for changing pads. It wasn't very expensive, but it is VERY light proof. I'm very persnickety about light coming into the room in the morning, and this worked GREAT!! I do think RocLon makes it. One thing I realized after I'd done several panels - it doesn't ravel, so if you are not going to see it, you don't even have to hem it , either on the sides or the bottom. When I finally realized this, I just cut to size, and sewed it on. Really sped up the process!