Ditto carsdlt. I've seen many a person put a car cover with a dirty/contaminated) underside over a clean car (ouch) OR a clean underside on a dirty car (ouch). With even a bit of a breeze, they can cause mucho scratching of the paint. Perhaps you might want to look at one that only covers the convertible top. The upside is that they keep prying eyes off your car; the downside is that they invite folks to lift it to see what is underneath the cover.