Abstract: A system for mooring boats to docks, consisting of two identical mooring devices, which will accommodate the wide variety of boat hull and dock designs and will prevent damage to boat hulls and docks by maintaining a distance between boats and docks while moored. The mooring device comprises a mounting bracket which may be attached to a dock in various positions and provides for pivotal attachment of mooring arm to mounting bracket which allows vertical movement of mooring arm while preventing horizontal movement of mooring arm. The mooring arm comprises an inner hollow elongated member telescoping within an outer hollow elongated member. A thru bolt secures the two telescoping members at a fixed length by means of vertically aligned holes in both of the two members. An end cap with two side by side openings closes the outer end of the inner member. A single length of rope extends through the bore of the two members.