Covers are semi-tailored to fit the most common vehicle shapes. For efficient ventilation, they are not designed to reach the ground. However, if you require ground-level coverage, please order the next size up.MEASURING YOUR CAR. Although the length of your car will give a good indication of the required cover size, a much more accurate method is to measure the total distance around your car, it’s circumference, at it’s widest and longest points. The following measurements are the maximum, stretched, total hem length for each cover. Dimensions for indoor and outdoor are the same.