Being as mine is red, and wary of fade in the future, and because I don't use it every day, I bought a specialised cover.
It's a bit creased on this photo as I'd just put it back on. My only criticism is the velcro flyhole for the sat nav aerial, which is open if you have one. So I've knocked up a rubber cover. It doesn't matter if a bit of wet gets through there because it's breathable. The disadvantage of these covers is that they can't be put over a hot car, or a dirty car, and the inside must be kept absolutely clean. It's a one man job to fit providing the wind isn't gusting. So far I'm very pleased with this. Four cross straps hold it on, each side of the wheels.