A slip cover for use with an automobile sun visor includes a deformable hollow body that has an opening through which the sun visor moves to be encased by the cover. The cover body includes portions that are heat shrinkable and portions that are stretchable. Heat from a hand-held hair dryer, or the like, is applied to the cover to shrink those heat-shrinkable portions to securely encase the sun visor. Indicia, such as advertising material or the like can be placed on the slip cover.