We have a Maypole cover, and for three years it covered our caravan outside on a windy hill. It kept it perfectly clean, and is breathable, so no problems with condensation. Rain doesn't get through and when you unpack the van it's as clean as when it went away! There are no scuffs or scratches on the paintwork, and the straps, are still tensionable and hold the cover in place. There are zips on two corners, so it's possible to get into the van by just undoing one zip and loosening, but not removing, one strap. There are just a few areas where there are 'sharp edges' on the van where we've had to reinforce the cover to stop it being worn, but otherwise it's still perfect and still keeping the van clean - now inside a barn, so protects it from dust and bird poo!