There are many reasons for having one of our canoe/kayak covers. The fabric is unbeatable. Vortex Canoe/kayak covers are made with the best marine fabric available. The fabric is marine polyester that is treated and sealed in multiple ways. Specifically, it is double polyurethane coated on the bottom, or down side, as well as UV protected and mildew protected. 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. It has a very "high end" look and feel, in addition to being quite heavy duty. The material is 600d. Most covers like this you will find are 300d or 150d, which are proportionally 1/2 and 1/4 as heavy and as heavy duty. 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 fairly 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. These have a zipper, and it is hard to keep all water out, given the zipper, and the fact that it has seams. If "waterproof" is what you need, please see our new vortex "waterguard" series.What really makes these worthwhile is that it takes a lot of the maintenance out of kayaking and canoeing. When spring rolls around and you can get out your canoe or kayak and pull it out of the cover and use it ..without having to dump wet leaves out of it, or water, or snow, etc..it is really nice...Or, in the summer, if you keep your kayak/canoe outside and do not have water in it..and mosquitos, it is also really really nice. We recommend these highly to anyone who has a canoe or kayak.This cover is 16" long, and will fit up to a 9" girth. Please see pictures. This is not a disposable type cover. It is made for years and years of use. It has a 5 year warranty.