In a world where lightweight and durable composites are increasingly replacing conventional materials, aramid and para-aramid fibers play an important role. They are essential for reinforcing composites where weight reduction and excellent damage tolerance are required. Many different kinds of composite goods are reinforced with aramid because of the strength, stiffness and dimensional stability of laminates that contain it. Aramid and Kevlar fibers are compatible or can be used with many types of resin systems. The best choice of resin system is epoxy as it adheres best to the fiber surface. Vinyl ester, and isophthalic polyester may also be used. Orthopthalic polyester should be avoided as it does not provide sufficient adhesion to the fiber.