In keeping with the Polyform tradition of quality and value, the HTM (Hole-Through-Middle) Fender provides maximum protection in a variety of applications. The center tube allows you to change the position of the fender at a moment's notice from vertical to horizontal. Designed for medium-duty use in both permanent protected and unprotected moorings. Features molded-in ribs for puncture and abrasion resistance, reinforced tube ends and even wall thickness for maximum strength and durability, and Polyform's unique vinyl valve system. For boats 20' to 30'.