DeckMate Premium 55" Pontoon Boat Seats Free Same Day Shipping. Order Before 4pm EST. We Ship Via FedEx. 55" wide pontoon boat seat with plush, pillowed cushion and plastic frame. Seat back bolts down to fully enclosed base and seat cushion hinges in place. We use two 27.5" fully enclosed bases with drain channels to span the 55" for more support. 30oz marine grade vinyl with double stop stitching and comfortable bolsters.