Abstract: An elongated thin flexible strip of plastic material is provided for removable securement beneath the ski of a snowmobile. The under surface of the strip is smoothly finished and has substantially no tendency to be subject to a build up of frozen snow thereon under certain temperature and snow conditions which cause snow to freeze to and build up on a metal snowmobile ski under surface. The strip includes longitudinally spaced opposite side tab portions by which elongated tension structure may be utilized to removably secure the strip to the underside of a snowmobile ski and further includes structure for embracingly engaging the usual elongated and longitudinally extending wear and steering bar which projects downwardly from the under surface of a snowmobile ski. Further, the strip is sufficiently flexible for the forward end thereof to project beyond the tip end of the associated snowmobile ski and to be bent back thereover.