The AVfol membrane material is made of two layers of premium PVC film, reinforced with a woven polyester mesh.  This construction ensures that your liner remains water tight even if a crack develops in the structure of the pool. The foil has high quality multilayer varnish that protects the surface from damage, aging, increases the UV stability of the foil and prevents the growth of bacteria. Our pool approved plain colors are aesthetically versatile and coordinate with every environment.