Turn any curtain into a thermal insulating blackout curtain with our thermal blackout curtain liner. Thick， ultra-soft woven material is the perfect and easy addition to your existing curtains. Made with our proprietary YarnLock Weave Technology， specialty yarns are woven tightly with black yarns to create a fabric seal- increasing thermal resistance and providing blackout benefits. Light gray face fabric matches behind any curtain color and flexible hand provides a perfect drape. Liners can be used with clip rings， on a rod pocket pole， and with the use of drapery hooks. Extra wide liner provides more coverage for windows， allowing you to open and close your curtains as you normally would. 100% Polyester. Sold as a single liner. Easy care， machine washable. Drapery hooks included.