PermaPRO (tm) Class A Covers, fits 40'-42'L, 122" max H. Manufactured with Rip-Stop technology Rip-Stop fabric is strong, light weight, dramatically improves tension strength and minimizes the chance of tearing. Distributed Stitching Pattern Ensures even distribution of tension throughout the cover, reducing failure of individual straps. New and Improved Strapping System Includes a weighted toss bag making installation easier than ever. No more crawling under your RV to install tension straps. Front and Rear Tension Panels and Elasticized hem corners Provide a more custom fit. Air Vent System Reduces wind stress and inside moisture. Sophisticated Zipper System Long zipper pulls allow access to any part of the RV even when covered. Expanding Bag Rip-Stop zippered storage bag which expands for easy storing. Longest Warranty in the Business 4 year hassle-free warranty.