Waterproof / Breathable covers

I'm looking  for advice on waterproof /breathable covers for my van, any recommendations, manufacturer, suppliers etc
Thanks in advance.

We have one of these:

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Note there are different sizes available, they are rather generous - we first bought the one that covered our dimensions but returned it for a refund as it was way too big. We re-ordered the next size down, which fits a treat.

You need to make sure it's a tight fit so that it won't flap about in the wind, which could scuff the gel coat.

It needs at least two people to fit.