I run with a full bra on my car all the time....extends up over the headlights. It fits tightly and has yet to rise up at speeds approaching 90 mph.  It does cover the grille (screen) and overheating has never been an issue, even at 90+ degrees (Yes it does get that warm here in the frozen nort'!) I only put it on when I drvie the car. Otherwise I remove it. Always remember to remove the mask if it gets wet. Moisture underneath the mask will reek havoc with the paint.....My two cents worth