The Blue Dog Marine Premium high back folding seat is built on a high impact marine grade plastic frame that’s designed with an extra high back with deep contours for unmatched comfort and support. This seat is specially billowed for extra comfort and features an extra-thick layer of high density compression foam padding that’s formed perfectly for exceptional comfort and lumbar support. Covered with extra soft, UV protected and mildew-resistant marine-grade vinyl for lasting durability that will provide years of use. The seat back folds down using corrosion resistant aluminum pinch-free hinges. Mounts easily with a standard 4-bolt marine mounting system