ADCO 32852 Designer Series Tyvek Fifth Wheel RV Cover ADCO All Climate Designer Series - Now up to 40 percent more Tyvek RV; 5th Wheel Contour Fits 3 Layer RV Cover The most durable ALL CLIMATE 5th Wheel cover on the market DuPont Tyvek top panel, now with up to 40 percent more Tyvek fabric, provides maximum protection against the sun's damaging U.V. rays Extends below most awnings 3-Layer High performance multi-color polypropylene sides insure maximum breathability