The Classic Accessories PermaPRO collection is specially designed to provide maximum protection to keep your RV in top shape All year long. Air vents, tensions panels, and extra-long zipper pulls are just a few of the things that make this cover one of a kind. Less bulky than most, our PermaPRO cover fits in a provided expandable storage bag. Permapro covers feature: Extra strength, lightweight PermaPRO ripstop fabric repels water and protects against dirt and sun damage, air vent system and quick drying PermaPRO fabric combine to reduce wind stress and vent inside moisture, adjustable front and rear tension panels and elasticized hem corners provide a custom fit, zippered panels allow access to the RV doors and storage compartments. Long zipper pulls reduce the need for a ladder, integrated strap attachment and weighted toss bag system eliminates crawling under the RV to install tension straps, tension panels reduce cover stress when tightening the straps, zippered storage bag unzips and expands providing five additional inches of height in storage space, and a limited lifetime warranty.