My son has a bedroom window that faces the sun in the morning. He wanted something that would keep out the light. I looked at several different fabrics but it was going to be quite costly. I finally decide to use dark brown bath towels/sheets that I got at Walmart. I used seam tape and ran it asong the top, making loops that corresponded with the curtains. It worked wonderfully and I figure when the window treatment is changed, I can take the seam tape off and use the towels. Hope this helps. :D