The cover is two layers, sewn together at the bottom perimeter. The blower assembly fills the space in between the two layers. The bottom layer rests on the car, the top layer either rests on the bottom layer or pushes toward the sky when active. There is no friction between the cover and the car finish because the bottom layer does not move because it is not exposed to wind. The fabric is also breathable so that moisture (from rain or dew point) and heat (from sun) can escape the paint finish. Here is a good video demonstrating the two layers, with a camera inside. https://youtu.be/Cv0sCiMVdfI