37-40' Waterproof Protection RV Motorhome Camper 3 Class A extreme protection cover for 37' to 40' motorhome RV's Roll-up zippered panels for door and storage compartment access Front and rear adjustable straps with quick-release buckles for a custom-like fit Mesh vents and breathable material reduce mold and mildew build-up Water-resistant UV-Treated 300D polyester fabric