Classic Accessories 129161001 RV PermaPRO Class C Cover - 23 - 26 Ft. 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 Integrate strap attachment and weighted toss bag system eliminates crawling under the RV to install the Tension panels reduce cover stress when tightening the straps.