A grommet for housing electrical wires constructed in accordance with the teachings of the present disclosure includes a mounting structure, a tube, and a plurality of stiffeners. The mounting structure is configured to mount to a panel of a vehicle, the mounting structure defining a first passage extending therethrough. The tube extends from the mounting structure and defines a second passage in communication with the first passage. The tube includes a corrugated portion having a plurality of ridges and a plurality of grooves interposed between the plurality of ridges. The stiffeners are interposed between those of the plurality of ridges that are disposed within a zone of the corrugated portion. The stiffeners extend partially around a circumference of the tube.