The polyester roof on this pergola is retractable so that you do not need to move your garden sofa set if you want to bask in the sun or on the contrary enjoy the shade of its canopy. This Murum pergola was designed so that it could lean against a wall. The roof canopy is mounted on rails with a pulley system so you need simply pull the rope to slide it from the closed position to the open position. This strap with Velcro fastening also allows you to keep the canvas folded up. The elements of the structure and roof are in aluminium. The pergola comes delivered in a kit and you need only follow the English instructions to assemble it and enjoy it without delay. - sweeek 3x4m Outdoor Retractable Aluminium Pergola With Canopy in Grey