Blackout cellular blinds rated fabric blocks up to 99 percent of outside light. This a great privacy feature. Blackout cellular blinds are the best choice for bedrooms, children's rooms, and media rooms where sunlight disturbs rest, work and play. Cellular blinds have a front and back fabric that is pleated. The two fabrics are connected to form air pockets (cells). Because of the air pockets, these shades have great insulation ratings. Although they look like pleated shades, unlike pleated shades, there are no visible holes or strings. For the offer the greatest amount of insulation and light blockage try cellular blinds.