Plastpro’s Polyfiber (PF) Door Frames are an innovative new alternative to traditional door jambs. Our uniquely formulated door frame combines the beauty of wood, but requires less maintenance and has a longer life span. The material is durable, long-lasting, and is more thermally resistant than either wood or metal. The advanced system can be installed the same way as traditional wood jambs with no added hassles. When a fiberglass door is used together with a PF Frame, they create an enhanced, impenetrable entryway.