The Pontoon Boat - known as a "Party Boat" by some - has a hull constructed of round tubes (called sponsons) that are attached to the outside, bottom edge of a large flat deck. The deck is surrounded on all sides by a safety railing. The helm station is placed either in the middle of the deck or off to one side. While the "Plain Jane" version uses lawn furniture for seating, "Deluxe" models may have built-in, upholstered seating, a dinette table, a roof, a cooler and maybe even a head (toilet).