This Cover is custom made for the Cirrus Truck Camper 620 from NuCamp RV. A very high quality materiel with a glove like fit. It has a strong zipper to allow access to the door of the camper plus a zipper that perfects the fit around the neck of the camper. This keeps your cover from being able to blow off. Plus you have a strap that goes the full length under the camper and 2 straps going the full width of the camper. You will be very impressed with the durability of the fabric. Heavy duty cover that will last much longer then your average cover. Breathable fabric to ensure your camper won't sweat under the cover and avoid mold issues.