A sliding roof system with a guiding rail profile, including a fastening section with a plurality of mounting domes for connecting the guiding rail profile to a vehicle-fixed roof portion. A water drainage section extending in parallel to the fastening section is provided, which water drainage section is adjoined by a guiding section to guide control kinematics for a movable roof part. The fastening section is provided with integrally formed stiffening reinforcements. The stiffening reinforcements are provided in the vicinity of the mounting domes and extend in the transverse direction of the guiding rail profile continuously into the water drainage section.