Polyform HTM Series Fender - Blue Whether hung vertically or horizontally, from your top-sides or the dock, Polyforms HTM Series excel. In keeping with the Polyform tradition of quality, the HTM hole-through-middle boat fender was designed to provide maximum protection in a wide variety of applications. Vertical ribs for extra protection, reinforced tube ends to prevent lines from pulling through if the fender gets caught in a tight spot, and extra wall thickness to resist punctures and tears ar