They are made with three-layer PVC + foam + PVC material, and they apply very easily because they have two elastic bands in the lower part of the glass and a click-clack closure in the upper part. When mounted it does not constitute an obstacle to opening and closing the window. For correct conservation it is advisable to apply it only during the period of use of the camper. The use of these protections will give several advantages as they protect the glass from the elements and retain more heat inside the vehicle during the winter period. Available custom-made for all Seitz windows on the market.