Polyform USA HTM inflatable fender. Color white. Measures 13.5" diameter x 34.8" length. 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 are just a few of the features this high-quality fender has to offer.