A length-adjustable protector that overlies, and protects, either a front or a rear bumper cover of a vehicle, and self-adjusts to the length of either the front or the rear bumper cover. The protector includes an inner, an outer, and a pair of intermediate layers. The inner layer faces, and overlies, a central portion of the length of either the front or the rear bumper cover. The outer layer overlies the inner layer. The pair of intermediate layers extend movably between the inner and outer layers, face, and overlie, remaining end portions of the length of either the front or the rear bumper covers, and in doing so, self-adjusts to the length of either the front or the rear bumper covers.