Vortex Marine Grade Canvas Top 37 38 39 40 Ft Class A Motor Home Motorhome All Weather Cover, 110" Wide, 120" Tall, Marine Canvas Top, Triple Layer Sides, Zippered Access Side Panels (FAST SHIPPING - 1 TO 4 BUSINESS DAY DELIVERY) 600 denier marine grade canvas top with 3 layer polypropylene fabric sides repel rain and vent inside vapors out. Designed to protect your investment from Harsh UV rays and keep interior cool. Superior water resistant yet breathable to prevent any mildew inside of the fabric. Customer Support: 1-800-309-5190 (8:30 am - 4:30 pm) Monday - Friday Full-Height zippered panels allow complete access to your RV regardless of door location.