I cover my seats with blankets. I use boat heaters also. I am looking for a mild and mildew resistant material to have fabricated to my pontoon cover.
You might like Noah. It's not really a boat cover material, but is well known as a car cover material. You have probably seen it before on a car cover, but didn't realize it. It's very soft, breathable and microporous . I use it for this exact purpose in my shop, so do many other.
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