Ready-Fit Car Covers are actually a semi-custom universal car cover. They are designed to provide a very good fit using incremental sizing, but is not custom made per vehicle. The Block-it 200 Series Fabric uses a grey 3 layer polypropylene construction that provides moisture and dust resistance as well as being treated for extra UV protection. These standard covers can be used outdoors on a limited basis against moisture because of the breathable fabric, any moisture or condensation can easily evaporate. These car covers are a perfect option for indoor storage use, but the extra UV resistance in the fabric makes is a nice option for outdoor use as well. It’s lightweight and easy to use. Soft and Non abrasive so it won’t scratch your paint. Two year limited Warranty.