ROOF SYSTEM

A vehicle roof system comprises a stationary part configured to be attached to a fixed roof and guide rails extending in longitudinal direction substantially parallel to opposite sides of a roof opening. A semi-transparent panel closes the roof opening and has a drain channel for draining water seeping past at least one edge of the panel. A rollo assembly includes a rollo cloth having a first edge connected to a winding shaft, and a second opposite edge to which a beam is connected and opposite lateral edges guided in the guide rails. The cloth is wound onto the winding shaft and wound off to uncover or cover the panel at least partly from below. At least a part of the channel extends transversely within the path of the cloth and comprises a first sliding surface in contact with the cloth to guide it when it is wound up or off.