Sea Ray 350 Sundancer Winter Boat cover. The Kinder Industries Sea ray 350 Sundancer Winter Boat Cover is fabricated using a Polyester fabric called Top Gun. Our Sea Ray 350 Sundancer winter boat cover is fabricated with six vents, entryway door and is fabricated to the highest standard. Our power boat covers are the best winter covers available on the market, and will provide years of coverage. Call for a price on a winter cover for your Sea Ray.