N74846 resumed it well: if you are looking for a canopy cover to protect your plane year around on tie down you need a cover more sturdy than the light cover offered by VANs. I personally use the light canopy cover sold by Vans year around... in my hangar! I also use it on tie down when I am away and find it convenient as bruceflys do. It is not totally waterproof but the canopy should be waterproof enough to that's not a problem for a temporary use outside. The main function of this travel cover is to prevent the plexiglass of the canopy to be scratched by flying debris blown by the wind, propellers or jet engines wash which seems to work well so far after 3 years of use.