US Patent 10308101 Hybrid tonneau cover

A tonneau cover for a cargo bed of a truck includes a rail system, and a panel secured to the rail system. At least a portion of the rail system or the panel is a layer jamming member having a layer jamming material operable to exhibit a first stiffness in response to a first confining pressure and a second stiffness in response to a second confining pressure. The layer jamming member may include all or a portion of the panel to provide specific regions of the cover, and/or may include portions of the rail system.