PermaPro Class A RV Cover gray X-Tall Fits 37'-40'L. Extra strength PermaPRO™ ripstop fabric repels water and protects against dirt and sun damage. The cover's air vent system and quick drying PermaPRO™ fabric combine to reduce wind stress and vent inside moisture. With adjustable front and rear tension panels and elasticized hem corners, you get a custom fit. Zippered panels allow access to the RV doors and storage compartments while the long zipper pulls reduce the need for a ladder. Integrate strap attachment and weighted toss bag system eliminates crawling under the RV to install the tension straps. Tension panels reduce cover stress when tightening the straps. Zippered storage bag expands for easy packing.