As the name suggests, the blackout lining is used to block the light. It is 100% Polyester. This is a dimout lining. It blocks 80% – 90% of the light. It is suitable for Bedrooms, Family Room or Nursery room where you are looking to get a better coverage than a standard liner. It adds body to your panels and shades.  It is available in 2 colors – Beige and Gray.  You can mention in instruction box while placing the order which color you would prefer to use.