Covercraft Custom Fit Car Cover for Porsche 911 (WeatherShield HP Fabric, Gray) Special additives to the encapsulation formula reduce fabric UV degradation Silicone polymers used in the encapsulation formula help create a silky smooth finish that's even less abrasive than flannel Allows any heat moisture or condensation under the cover to easily escape Has bottom-edge elastic to hold the cover tight and is equipped with grommets for a cable lock and an additional grommet that can be installed to accommodate your vehicles antenna Custom-made to hug every contour of your specific vehicle and most of these made-to-measure covers have sewn-in mirror pockets