Blackout Lining is used for backing Curtain Panels. Seeps away the dangers of the sun from damaging the fabric it is covering. Its also used a sound barrier. Most in home client use this item to sleek up the fabric and give it a dense feeling. This blackout drapery lining reduces sound and helps reduce out-of-room noises at the window. Perfect for homes, nurseries, schools, and workplaces, this drapery lining insulates and helps keep rooms cooler in the summer and warmer in the winter.