Vortex Canoe/kayak covers are made with the 1200d marine fabric. it is double polyurethane coated on the bottom, or down side, as well as UV protected and sealed. Polyester has a very rich color and holds up to UV exposure very well. It also is very strong, resists stretching, retains it shape well. These completely enclose the canoe/kayak. These have a zipper that runs roughly 1/2 way down one side, making it very easy to install and remove. These are weatherproof, but not totally waterproof. They are excellent at keeping your canoe/kayak clean. They are excellent at keeping out bugs, leaves, etc, as well as most water. It carries a 5 year warranty.