Specially designed for trailers. Zippered panels allow access to the side and rear. Special features: full-height zippered panels allow complete access to the door, side and rear; adjustable front and rear tension panels provide a custom like fit; air vents reduce wind lofting and inside moisture; unique rope tie-down aid; storage bag, rear ladder cap and tie-down rope included; elasticized corners for fast and easy fitting. PolyPro III Fabric: triple layer polypropylene top resists and repels rain and snow yet vents inside water vapor out. Prevents mold, mildew and ice buildup. Rugged U.V. resistant polypropylene fabric sides.