Specially designed covers for Class C RVs feature triple layer PolyPro III top that resists rain and vents water vapor out. Zippered panels allow access to all 4 sides. 3-year limited warranty Cover Type: RV, Material Type: Polypropylene, Top Layer (qty.): 3, Side Layer (qty.): 1, Zippered Access: Yes, Elastic Corners: Yes, Air Vents: Yes, Storage Bag Included: Yes, Tie-Downs Included: Yes, Fits Length (ft.): Up to 20 Prevents mold, mildew and ice buildup Adjustable front and rear tension panels provide a custom-like fit Includes rear ladder cap