Abstract: This invention is directed toward a frost-prevention device which sits on a vehicle windshield. The invention consists of a thin sheet of suitable fabric with ends long enough to extend beyond the sides of the windshield into the space between the car door and the door jam. The invention also has top and bottom portions which may be tailored to accommodate the curves from the bottom of the windshield to the hood of the car and from the top of the windshield over the roof of the car as desired. Because the device can be physically restrained when a user closes a car door on the sides of the invention, it is not only theft-resistant but also can be secured to the windshield of a vehicle through this means, thereby allowing it to remain in place with no additional means of fastening the device to the window or windshield.