Three layers is a three pass.
Insulated lining fabric for curtains.
Primitive linen curtains 100 blackout curtain drapes burlap fabric curtains with white thermal insulated liner grommet top curtains living room bedroom 2 panels 52 x 72 inch natural 4 6 out of 5 stars 679.
Free shipping by amazon.
French blackout heavy black flannel is placed between the decorator fabric and regular lining to create a full blackout highly insulating drapery treatment.
Find lining fabric for window treatments at joann.
Good insulation is created by placing blackout lining between flannel backed lining and the decorator fabric.
Kgorge 100 blackout curtains liners sunlight block insulated window drapery liner thermal insulation drapes lining easy installation bonus hooks included 2 pieces 45 wide by 77 long black 4 4 out of 5 stars 357.
Get it as soon as wed sep 23.
Blackout lining is made by adding two or three layers of acrylic paint to a thin fabric base.