What is a Thermal Drapery?
Thermal drapery - A type of drapery with an extra insulated lining, which protects against heat and cold and also keeps out most sunlight. Also called blackout drapery.
Ideal Home Garden Explains
Thermal Drapery conserves energy by blocking out direct sunlight into a living space and then cooling that area. These types of drapes have been found to last longer than standard drapes because of the material they are manufactured with. Thermal drapery is available in many different sizes and colors.