It is made of PVC. Since it is manufactured as UV Beam Resistant, it is called â??Pond Typeâ?? Geomembrane. Because of UV additive, it is direct sun beam resistant for ages. That kind of Geoser PVC Geomembrane is comfortabely used without coating the surface of it. It is manufactured in gray, blue, yellow colours. Geoser PVC GEOMEMBRANES are manufactured in a width of 2,10m; standard lengths of 20m&25m; with thicknesses of 1,00mm & 1,20mm & 1,50mm & 2,00mm & 2,50mm & 3,00mm. When it is demanded, they are manufactured in optional lengths.