Palm Surf Backrest Seat  This low profile sit-on-top backrest is made from thermoformed foam with a reinforced back section. It snaps into the D-ring attachment points on the deck of your boat with corrosion resistant steel clips, mounted at four points for stability. The seat angle can be adjusted by the webbing straps. Features: Size: One Size 25 mm polypropylene webbing 4 cm thick foam Powder coated steel attachment clips Materials: nylon elastane mix fabric Dimensions (HxWxD): 27 x 51.5 W x 4 cm  /  10.63 x 20.27 x 1.57 in Weight: 636 g  /  22.42 oz