This roof window roller blind, fitting for Velux window systems, is suitable for any room in your home or office. With a central pull mechanism, the blackout blind can be adjusted from bottom to top to meet your needs on different occasions and moments. Made of dirt-resistant polyester with a special heat blocking aluminium coating, this blackout roller blind can retain heat in the room in winter and reflect solar heat in summer. It is easy to install with the included mounting accessories. Please note that the product size code should match the product code of your Velux window. Where to find your Velux product code? It can be found at the top of your window, and please check our size guide in the pictures.