An air bag cover includes a mounting leg having an enlarged foot captured between the base plate and the inner plate. The base plate has a channel formed along its outer edge. The inner plate overlies the base plate and has an outer end portion that partially overlies the channel to capture and retain the foot of the mounting leg within the channel both prior to and upon opening movement of the air bag cover during air bag deployment. The base plate, the inner plate and the leg are configured such that the initial opening movement of the airbag cover is obtained by rotation of the enlarged foot within the channel, and then the continuing opening movement of the cover is obtained by bending of the mounting leg while the enlarged foot is constrained against further rotation within the channel. Auxiliary tear lines may be provided in the cover, particularly at or near the corners of an air bag flap to further enable low force opening of the cover.