The fabric is usually heavy and tightly woven, coated with a light-blocking layer or has a special finish. Blackout fabrics are often used in window treatments, such as curtains or blinds, to create a dark and private environment. The use of blackout fabrics on windows reduces glare on TVs and computer monitors, completely darkens bedrooms for sleep, and increases energy efficiency by reducing heat and light entering the room. In hotel rooms, blackout fabric blocks light from entering the room to ensure a good night's sleep for tired travelers.
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