Blackout curtains are a must-have if you want complete darkness and want to block out all of the natural light in a space. Keeping the lights out can help us relax and rest our eyes. Our room is wholly darkened thanks to the blackout curtains. Curtains made from Thich fabric won’t cut it if you want to filter out light. Given that even the densest curtains let some light through, they cannot completely block it out. Blackout curtains are a spec..