-We specialize in RV covers and design protective covers for all types of RVs. Key Features and Its Function -600D Top Polyester -210D Side Polyester Waterproof Protection and Ventilation -Mixed with Waterproof Membrane -Air Vents on Each Sides Windprood Protection and Custom Fit -3 Extra Ultra-long Straps: 1 horizontal strap and 2 over roof straps -Several Bottom Windproof Straps -Adjustable Front and Rear Tension Panels -Elasticized Hem Corners Tearproof Protection -Reinforced Edges and Corners -Gutter Covers Included Anti-UV Protection -Anti-UV Agent From 4% to 5% Easy access In and Out of the RV -Roll-able zippered doors on passenger side and the rear, suitable for toy hauler BEFORE PURCHASE -Do not rely on the manufacturer's specifications. Get the cabin length by real measuring and make sure the cover’s length, height and width is long enough for the cabin. -If the roof length or cabin length gets close to the edge of the size range, please choose the next larger size and use the straps in the package to tie the cover right. -Measurement should include all external accessories such as AC unit, ladders, spare wheel, antenna, etc., but should not include tow bar, tongue jack, propane tank and wheels.