This cover features Yamaha's "Vacu-Hold" design, which creates a vacuum inside the cover during transit to draw the cover down snugly on your Sport Boat. Benefits include reduced deck abrasion, reduced air-induced stress on the seams, and less aerodynamic drag. Constructed of ultra-durable "Surlast" fabric for the ultimate protection against fading and the elements. It is also non-abrasive, water repellent, and provides UV, mildew, and rot resistence. Additional features include a handy convenience zipper for access to the fuel tank cap and an anti-pooling system to reduce the possibility of water pooling on your cover's surface.