Waterproof Seat: The boat seat surface is made of PVC leather, providing waterproof, wear-resistant, and UV-resistant features. Expertly stitched to avoid tears, its designed to withstand marine and outdoor environments, ensuring durability. 5.1' x 5.1' Bolt Hole Installation: The folding boat seat features a 5.1' bolt hole spacing. We provide corrosion-resistant screws and washers, making it easy to securely attach the seat to most boat swivels or bases. Please note, the boat base and swivel are not included. No Fatigue After Long Sitting: The backrest and seat cushion are made of high-elastic thick foam, providing softness and resistance to flattening. The flip up boat seat ensures comfort for long hours on the water, relieving pressure on your back, spine, and hips. Foldable Design: The backrest of our fishing boat seat can be smoothly unfolded or folded, making it easy to store without taking up too much space