Class B RV cover is made out of a long lasting 300-denier polyester material. The cover provides all-weather protection for your vehicle. Cover is 100 percent waterproof, with an added DWR coating for ultimate water protection. Cover is also manufactured with taped seams to ensure that no moisture penetrates through to your RV. Cover has full height zippered panels that allow complete access to your RV while it is covered. Cover has a reinforced top for added protection from the elements. The Class B RV cover is fully breathable to prevent the growth of mildew and rot. Free storage bag is included.