Unlike other portable buildings, no drilling or field cutting is required. Main Cover and Doors are made from long life UV Resistant Fire Retardant Poly Material with Fabric Backing. All fabric componentsfeature Heat Welded Seam construction. ShelterKing units feature double zipper doors on Both Ends to allow for access from either end, drive though capability, and good ventilation. Each door contains a pocket for a rigid pole and grommets for securing them up during use.