Extra strength permapro ripstop fabric repels water and sun protects against dirt and damage.Features. Air ventilation system and quick-drying PermaPro fabric combine to reduce wind stress and wick away moisture. Adjustable front and back tension panels and elastic hem corners provide a custom fit. Zipper panels allow access to RV doors and storage compartments. Long zipper pulls reduce the need for a ladder. Integrate Strap and Counterweight Toss Bag Attachment System eliminates crawling under the RV to install the tension straps. Tension panels reduce stress on the cover when tightening the straps. Zippered storage bag expands for easy packaging. Model Type ? 1.Travel Trailer Cover. Gray. Fits up to 20 ft.. Maximum Height - 118 in.