This edge-reinforced cover for windows is made from a strong foam-aluminum foil with securing tabs. It protects against snow and frost in winter and against sunlight in summer. The attachment is extremely simple, as the securing tabs are clamped in place when the doors are closed, making the foil theft-proof. An additional securing option using Haden rubber bands is also possible. Versatile use is another feature of this foil, as it can be used as an insulating mat during breakdowns, camping, and leisure activities.