This vented two tone gray cover is breathable, resists to high humidity & rainfall with UV protection, offers moderate weather protection. It is made of 3 layer fabric top & 3 layer polypropylene sides. It fits 25 foot 7 inch to 28 foot length travel trailers & measures 342 inch length x 108 inch width x 126 inch height. It includes zipper entry panels & quick connect buckles.