A roll-up covering for motor vehicles comprised of a rectangular main section 10 and side flaps 14 with antenna slits 18, 20 in either to accommodate antennas. A cylinder 16 is fixed perpendicular to the length of the main section and located between the main section and the top of the vehicle while in use. The side flaps 14 partially cover the side of the vehicle while in use and fold over the top of the main section for removal. Combined, the covering rolls around the cylinder for compact storage. Rear adjustable straps 26 anchor the covering in the rear compartment of the vehicle for theft prevention and as a means of changing the fit of the covering. Front elastic straps 11 and side elastic straps 12, in conjunction with the rear adjustable straps and the cylinder, tension the main section and side flaps to provide an airspace 34. The airspace between the covering material and the majority of the top vehicle surfaces provides for insulation and ventilation.