HEAVY DUTY FABRIC : Pop up camper cover have the extra thick 7-layer top are much tearing-resistant than other cover, protects your RV from rain, snow, dust and scratches, providing all-weather protection and extending the service life of the car cover. VENTILATION : Rv cover 6 vents on both sides to reduce wind pressure and internal humidity. breathable material can maximize the evaporation of water under the cover, keep the inside of the cover clean. WINDPROOF : The 3 straps and buckles and sewn them at the bottom of the cover, which are more anti-aging than the outsides, and also reducing the possibility of tearing the cover from side panel. Adjustable elastic edges and corners provide a custom-made fit to better protect the shell from wind blowing away and tearing. EASY To OPERATE : Folding camper cover easy to install and disassemble. Contains a portable storage bag for easy storage and reuse without taking up space. Size: Folding Trailer Cover 21' L 7.3' W 3.5' H fits 18-20 ft folding trailers. BEST CHOICE : Package: Camper Cover1, Buckle Straps4, Patch Kit2, Throw Bag1, storage bag1.