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 SOT with corrosion resistant brass clips€š mounted at four points for stability. The seat angle can be adjusted by the webbing straps. FEATURES: Materials:Nylon Lycra€š 25 mm nylon webbing€š Polypropylene middle section Weight: 636 g Dimensions: 27 cm H x 51.5 cm W x 4 cm D Other Features: Attachment straps with attachment clips