I'm not keen on car covers as I never get them secure and wind can do damage along with car not breathing etc., but by accident, I had a waterproof sail canopy in my hut which was no use when it rained as it just created a small swimming pool on top of my framed canopy so it went back in the hut, so the other day I put it on my 370z to try it out, it has 4 ties, one at each corner, so I secured back ties onto exhausts at rear and the other two tiesunderneath front bumper and secured both ties to my torqen towing eye. Surprisingly it has been great over these past couples of days, the wind flows from front to back and airs the car and blows all the snow off, car is bone dry underneath, very pleasedThis was a 3mx 4m sail canopy bought off eBay