Tonneau is a French term meaning cover, cask, or rear sitting compartment of a vehicle. The term was originally applied to define the cover of the open rear seat on many early model automobiles. These early versions of tonneau covers normally had a rear-facing hinged door and were made in two parts (frame and cover).
At the turn of the 20th century larger trucks were introduced and the tonneau cover transitioned from a cover for the rear seat of an early model car into the truck bed covers we know today. During this transition they were made of cloth or vinyl which uses a rib-like structure to support the fabric and keep it taut. Soon after the soft cover was developed, a hard cover was introduced to the market. These hard covers were made of aluminums, fiberglass, and soon to be hard plastics.
Excellent impact resistance
Excellent aesthetic qualities
Extremely durable and scratch resistant
Good strength and stiffness
UnderCover did not stop with their Classic tonneau cover, but developed the SE, and took it a step further with the SwingCase; an ABS swingout tool box storage system. Then, in 2011 they delivered the first "paint-to-match" ABS hard tonneau cover, known as the LUX, and the hard-folding Flex tonneau.