Our docking line Flexline from PolyRopes is a braided mooring line where the core is a composite of polyester and polypropylene – which makes it somewhat elastic. The casing is made of 100% UV-protected polyester for a soft and durable line capable of many years of use on board your boat. Sinks when submerged. Delivered with a secured seam at line end and a finished eyelet at the other line end.