Phiferglass fiberglass screening is constructed of vinyl-coated fiberglass yarns. Phiferglass is strong, long lasting and is not easily damaged, which makes it virtually the "carefree screening." Fiberglass screening is available in a choice of several meshes and colors. It is the original equipment on many windows, particularly those windows which have "half-screens," and on many storm windows. Phiferglass is also the ideal choice for large patio enclosures and for pool enclosures.