Block out curtains offer you privacy and insulation from the heat or the cold. Perfect to use in cinema rooms, bedrooms or nurseries where light needs to be blocked out. Complete the look by adding a pelmet above your curtains. This will fully block out the sun, adding further insulation. Due to its insulating properties using blockout curtains and pelmets in all areas will help lower your energy costs.There is a wide variety of coated blockout fabric to choose from. However, if the fabric is uncoated then we simply add a blockout lining. A sheer as the front curtain with blockout lining as the back curtain has been a popular and stylish option, also very cost effective and practical.