Parker SE 21 Boat Cover. Cover is Fabricated using a Super Durable Material called Top Gun. This Polyester fabric Will Provide Years of Service and Will Provide Your Parker SE 21 with Superior Protection From the Elements. The Parker SE 21 Boat Cover is Fabricated with Reinforced Tie-Downs, Vents and an Entryway Door. Call and ask about our line of Parker Boat Covers.