A wind deflector assembly for use in an open roof construction for a vehicle having a roof opening in its fixed roof, the open roof construction comprising: a stationary part, and at least a closure means movably connected with the stationary part and adapted to close the roof opening in the fixed roof and to selectively open it; the wind deflector assembly being positioned near the front of the roof opening and being movable between an ineffective position below the fixed roof and an effective position above the fixed roof, the wind deflector assembly comprising: an upper elongate member having arms (7, 7') extending in a rearward direction, each of which are movably connected to the stationary part, by means of a hinge member (8, 8'), a flexible wind deflecting material attached by means of a lower connecting part to the stationary part and by means of an upper connecting part to the upper elongate member to keep the flexible wind deflecting material taut in at least the effective position, said flexible wind deflecting material comprising a frontal part extending substantially along the front of the roof opening and further a lateral part (13, 13') extending from the frontal part to an end part (14, 14') of the flexible wind deflecting material near the hinge member (8, 8'), wherein said flexible wind deflecting material comprises a first area having a first weaving density, the flexible wind deflecting material further comprises at least a second area having a higher weaving density leading to a higher stiffness, characterized in that the first and second areas are one woven product and each of the areas are integrated in the product and interconnected to each other via the weaving process, said second area being shaped as a strip and extending at least partly in the frontal part and in the lateral part (13, 13') and being bound on both sides by flexible wind deflecting material having a different weaving density. a stationary part, and at least a closure means movably connected with the stationary part and adapted to close the roof opening in the fixed roof and to selectively open it; the wind deflector assembly being positioned near the front of the roof opening and being movable between an ineffective position below the fixed roof and an effective position above the fixed roof, the wind deflector assembly comprising: an upper elongate member having arms (7, 7') extending in a rearward direction, each of which are movably connected to the stationary part, by means of a hinge member (8, 8'), a flexible wind deflecting material attached by means of a lower connecting part to the stationary part and by means of an upper connecting part to the upper elongate member to keep the flexible wind deflecting material taut in at least the effective position, said flexible wind deflecting material comprising a frontal part extending substantially along the front of the roof opening and further a lateral part (13, 13') extending from the frontal part to an end part (14, 14') of the flexible wind deflecting material near the hinge member (8, 8'), wherein said flexible wind deflecting material comprises a first area having a first weaving density, the flexible wind deflecting material further comprises at least a second area having a higher weaving density leading to a higher stiffness, characterized in that the first and second areas are one woven product and each of the areas are integrated in the product and interconnected to each other via the weaving process, said second area being shaped as a strip and extending at least partly in the frontal part and in the lateral part (13, 13') and being bound on both sides by flexible wind deflecting material having a different weaving density. an upper elongate member having arms (7, 7') extending in a rearward direction, each of which are movably connected to the stationary part, by means of a hinge member (8, 8'), a flexible wind deflecting material attached by means of a lower connecting part to the stationary part and by means of an upper connecting part to the upper elongate member to keep the flexible wind deflecting material taut in at least the effective position, said flexible wind deflecting material comprising a frontal part extending substantially along the front of the roof opening and further a lateral part (13, 13') extending from the frontal part to an end part (14, 14') of the flexible wind deflecting material near the hinge member (8, 8'), wherein said flexible wind deflecting material comprises a first area having a first weaving density, the flexible wind deflecting material further comprises at least a second area having a higher weaving density leading to a higher stiffness, characterized in that the first and second areas are one woven product and each of the areas are integrated in the product and interconnected to each other via the weaving process, said second area being shaped as a strip and extending at least partly in the frontal part and in the lateral part (13, 13') and being bound on both sides by flexible wind deflecting material having a different weaving density.