Provide triple the protection compared to standard covers. Polypropylene sides ensure maximum breathability and virtually eliminate mold and mildew. Breathable 100% polypropylene covers are easy to install. Secure with straps and buckles. Exclude hitch when measuring your trailer to determine the proper fit. If your trailer has a roof mounted A/C, add 1' to length. 88"W, up to 42"H. 3 year warranty. 1/box.