The car auto cover is not simply a car cover, it has to do so much more, just take a few minutes and run through the following list, it could save you bucks.
Depending on where you are going to store your vehicle, outside a waterproof cover is still the only choice, as a decent type not only protects against water, but also dirt, grime, frost, snow, small wind debris, tree sap, birds, hail, snow, Sun ultra violet, if the vehicle will only be stored inside then it generally will only need dust, dirt and grime protection.
Did you know..if a non waterproof cover is fitted and this gets wet it can actually do more damage than not having a cover in the first place, this is due to the cover actually holding water and moisture against the surfaces of your vehicle.
A general cover is fine for covering a car that's not cared about too much, but ill fitting ones have more pockets which hold water when it rains, and they move due to wind and rain, this can over time depending on the inside of the cover actually lead to scratches and swirl marks, so purchasing a cheap cover really can be false economy.
Even mild sunshine over a period of time will dim any cars paintwork. An opaque car cover will help to greatly reduce the risk of this. It must also be breathable, if a vehicle is covered whilst the engine is hot or on warm day's moisture/condensation can form, and if it cannot escape then it can aid the creation of corrosion.
An auto car cover which is actually designed for your car model will not only be easier to put on, but it will certainly look much tidier when fitted. A decent car cover will last you many years if properly looked after, when looking for your cover checkout the manufacturer's warranty period 4 years is not uncommon.