Shading Specialists Limited offer a full range of Dimout blackout blinds. Dimout blinds are a Roller blind with a headbox and side channels, this with a blackout fabric means that when the blind is in the fully closed position, the room is completely dark. With a normal conventional roller blind, the sun shines through the sides of the blind. This is a full blackout option. Take a look at one of the PDF’s for an idea of what the system looks like and how it works.