This THERMAPLUS blackout curtain liner is the perfect choice for easily converting your existing curtains into blackout ones. The liner contains multiple bonded layers of foam that create a hotel-quality, 100% true blackout environment. It provides absolute privacy, heating and cooling cost-cutting benefits, as well as sound dampening. The liner is compatible with all types of curtain heading styles, measuring 40" to 54" wide. It is available various lengths for curtains of all sizes. Made from quality materials that are long-lasting and easy to clean.