LIBOLON uses very thin and soft yarn in its block out functional fabrics, including home textiles, home fabric and curtain fabric. Blackout curtains have a high-density satin weaving design. The blackout curtain fabric is flame retardant recycled fabric, and can effectively block out over 99.5% outdoor light penetration. The LIBOLON functional fabric blackout curtains can be used as flame retardant curtains, or in video rooms at schools or theaters.