Wise 8WD431 Premium Helm Seat Features 6" Thick High Compression Foam Padding for Unmatched Comfort. Injection Molded Plastic Frame. UV and Mildew Treated Marine Grade Vinyl with Embossed Surface. Strong Aluminum Arm Rest Bars. Heavy Duty Aluminum Back Support Bracket Flex Slightly for Added Comfort. Mounts to any BIA Standard 4 Bolt Pedestal System. 6 Year Warranty on Frame, 3 Year Warranty on Upholstery.