The Ace Jr Car Top Carrier is weatherproof + and attaches to vehicles with or without a roof rack. Attach the carrier's straps to a vehicle’s roof rack or use the Car Clips to attach the straps to a vehicle's door frame weather molding. The carrier is made from UV protected PVC Semi-Coated Mesh for maximum durability. Gear up with confidence on your next family vacation, backwoods expedition, shopping spree, or move.