Lined or insulated drapes have an extra layer of fabric on the inside. If left closed, they let lined drapes let in very little light and help insulate against drafts. Unlined drapes, on the other hand, may be somewhat sheer depending on the fabric you choose, so you should still see a little light when they are closed. Choose insulated drapes if your windows are particularly drafty, if you have a home theater that requires complete darkness, or if you like the look. Lined drapes hang differently and keep their shape better than most unlined versions
