Elegance Faux Silk 54 by 63-Inch Lined Pole Top Panel, Slate Blue 100% Polyester Imported In summer or in hot climate, thermal panels help keep the cool air in and the hot air out by blocking the sun heat coming through the windows; In winter or in colder climate The addition of a cloth lining to the back of the panel fabric creates distinct advantages over an unlined panel Lined panels normally last much longer than unlined panels Black-out design keeps light out- blocks out 99-percent of light and reduces noise also Durable, long lasting, polyester