The current trend in window treatments are roller shades made of a sheer fabric called ‘sunscreen' that blocks UV rays and glare without cutting out natural light. Popular in commercial venues such as banks and restaurants, home use is becoming more common with the introduction of different colors. This innovative fabric is composed of a PVC-coated fiberglass yarn that does not cut down on outward visibility. Roller shades are a single, flat piece of vinyl (or fabric) that is attached to a spring loaded roller or cord loop system. They can be mounted inside or outside of a window casing and rank at the top of the list for window shades with room darkening qualities. Roller shades on spring loaded rollers are lowered by simply pulling the shade down and raised by giving a slight tug at the bottom, to activate the spring. Some roller shades use a simple cord loop system on continuous feed.