Download image. amazon.com: pontoon boat seat covers boat seat cover color white, weather-resistant marine canvas, fits over the chair and armrest, superior fabric to protect captain’s chair from the elements.. Specifically designed to protect a captain’s chair from harmful uv damage, dirt and environmental hazards. enjoy a clean seat each time the boat is used with this convenient accessory. each cover has a durable 1/8″ braided rope in the hem with cord lock for a secure fit. available in sunbrella