I've used these on all my Clio 182s for the last 6 years. Outdoors, all-weather, year in, year out, zero issues. The later versions are much better.
Shop the latest Halfords All Seasons Car Cover Small at Halfords UK
www.halfords.com
I usually give the car a clean-off before covering it, then stick some of those cheap dehumidifiers off Amazon in. From October to December I'll uncover it, check the dehumidifiers and change them if necessary, give the car a quick wipe-over, and then leave until Spring.
My mate parks his race car up in October and doesn't uncover it until March. No issues. They have a soft lining inside so won't damage paintwork, as long as you don't pick anything up from the ground.
Definitely better covers out there but cost 4 times as much and these do the job.
NOTE - I have a really expensive one which i got with my track car, but don't use it. The car was stored inside a rather nice garage parked next to a Ferrari, so it's a top-notch cover.
I'd flog you that as I don't need it.