Vortex Marine Grade Canvas Top 27 28 29 30 Ft Travel Trailer All Weather Camper Cover, 105" Wide, 108" Tall 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.