A vehicle includes a roof having a roof opening between respective sides of the vehicle body, and guide rails attached to respective sides of the vehicle body. A cover having guide elements is slidably engaged to respective ones of the rails to slide the cover between a closed position in which the cover covers the opening and an opened position in which the cover exposes the opening. A first sealing section is connected to one of the respective vehicle body sides. A second sealing section is connected to the cover on the respective body side. The sealing sections enclose a wedge line. A seal is between the sealing sections. The seal is compressed when the cover is in the closed position and is relaxed when the cover is in the opened position in response to a wedge effect generated by the wedge line as the cover slides along the rails.