Pontoon docks are built using pontoons, which are buoyant structures. These pontoons are often made of materials like high - density polyethylene (HDPE), concrete, or aluminum. HDPE pontoons are lightweight, corrosion - resistant, and popular for their durability in various water conditions. Concrete pontoons offer greater stability and load - bearing capacity due to their mass, while aluminum pontoons are known for being both lightweight and strong. Installing a pontoon dock is relatively simple compared to fixed docks. And it has good mobility and adaptability.