To line your curtains with blackout lining, simply add one unit of lining for each curtain panel in your order to the cart. Please pick the same size for your lining as your curtain panels, and that's it! We will sew your curtains with our room darkening, blackout lining instead of the default privacy lining. Our blackout lining is a specially coated, thick-woven fabric, produced specifically to block incoming light to a considerable degree. Since heat is associated with light, it also blocks heat transmission which is of great help during summer to keep the home’s interiors cool. In winter, it reduces energy spendings on your boiler and heating system as it reduces the loss of thermal energy through the windows considerably. The thick weave of the fabric also helps to muffle sounds, making your drapery capable of blocking out shrill external noises substantially. In short, blackout lining helps the drapery to block light, heat and sound substantially. Our blackout linings come in three colors - white, beige and grey - offering clients plenty of bandwidth to appease any decor style, especially if the rear side of the window treatment will be visible to an adjoining room or an outdoor living area. The white lining toes in line with the bright and airy aesthetics of casual spaces and decor styles like farmhouse, coastal and Scandinavian, and comes across as a privacy lining at first glance due to its colour. The beige lining is preferred for warm-coloured face fabrics and the grey lining for cool-coloured face fabrics for better colour coordination. Overall, the blackout linings offer three neutral options that are incredibly versatile and can be teamed with all the drapery fabrics in our collection. Before we move on, we must mention that although the blackout lining is quite effective at blocking light, it is not 100% light-blocking. During brightest hours, daylight may diffuse through the lining of curtains and be visible like a soft glow on the frontage. There also are other factors beyond just the lining itself that play a role in how well-contained light leaks can be. To read more about this in detail, and for tips to maximise the performance of your blackout lining, please visit our page on Drapery Lining Options.