Transform any curtain panel into a light-cutting superstar with this practical white blackout liner. Sure, your curtains may provide privacy, but maybe they lack a little in the room-darkening department. Pair them with this pick to fix that and to help create a unified look from the outside of your home. Simple to add to your existing window treatments, you'll soon be off to lullabye land. With a 78-inch length, it's suitable for most windows.