CarCapsule (CCO18 Tan 18' Inflatable Outdoor Car Cover and Storage The bubble is made of heavy duty 16 mil PVC with UV protection and hot air welded seams that is cold crack flexibility to -20 degrees The basemat is made from 18 mil PVC that is mildew, abrasion, flame resistant and also impervious to oil, gas, and antifreeze Heavy-duty 100 percent nylon coil zipper to prevent scratching It's easy to order the correct size; Simply measure your car from bumper to bumper and from outside of tire to outside of opposite tire, add 6" to your overall length and this is the correct size you will need to order Overall Size 18' - 216" x 78" x 68" (Length x Width x Height)