The problem with my Madstad setup is noise. Air from under the screen hits my neck and creates noise in the helmet. Turbulent air from above the screen is hitting top of helmet and creating booming noise. I get plenty of air flow. I guess I should have bought a taller Madstad, but I went with their recommendation. I think mine is a 20 inch, but I made the mistake of getting the sportier looking screen than has less coverage on the lower outsides. BTW, I’m 5’8”.