RV Covers-Tent Trailer-Polypropylene-16FT 1 INCH TO 18FT Tyvek camper covers protect your folding trailer from harmful UV rays as well as dirt, dust, rain, bird droppings and more. Polypropylene sides ensure maximum breathability and virtually eliminate mold and mildew. Two layer Tyvek® top panel resists water and allows trapped moisture to evaporate from within. Strap and buckle attachments prevent billowing on windy days. Heavy-duty zipper doors for easy access. Reinforced corners resist tears and snags. Includes storage bag and polypropylene ladder cap. Exclude bumpers when measuring RV to determine proper size. If your trailer has a roof mounted air conditioner, add 1' to length. Tapered to fit trailers up to 26', up to 54" tall and 88" wide. 2 year warranty. 1/box.