Roc-lon Special Suede Poly/Cotton Insulated Drapery Lining, 54-Inch, White Ultra-violet resistant helps prevent sun-fading of decorative fabrics, carpeting and furniture Helps eliminate the discomfort of drafty windows, making rooms more comfortable due to increased efficiencies afforded heating and air conditioning Provides a degree of opacity which helps to block bright light from entering the room and filters it, creating a subdued lighting effect