Wise BM1145 Premier Series 50" Long Pontoon Bench Seat is Constructed with Marine Grade Frame System. All Premier Seats Feature Elongated Seat Bottoms and Taller Back Cushions For All Day Comfort. Soft Touch UV and Mildew Treated Marine Grade Vinyl. Plush High Compression Foam Padding. T-Nut Hinged Set Cushion Lifts up to Reveal Storage Area When Mounted on Wise BM1145-1B-990 Premier Series 50" Pontoon Bench Base. (sold separately)