100% BLACKOUT CURTAINS:They are faux linen curtains and they are 100% blackout.Because of the greyish white lining on back,these full blackout curtains can block out 100% sunlight and UV rays. The greyish white liner we used are more soft and stable,it can be hand wash and machine wash.They can be used as bedroom curtains,living room curtains,office curtains and so on.