To Clear! Blackout Fabric, a very durable fabric with a range of practical uses for curtains, leisure, educational buildings, theatrical displays, drapes and drapery, car show rooms, film and media industry, works perfect in a dark room where sunlight light or general day light can create problems, for a total 100% Blackout it is advisable to use this fabric with a 3 pass blackout lining, with this format you can be assured light will not pass through the fabrics.