Bests & Worsts Reviews from Amazon

10 layers with waterproof outside and soft underside. It has elastic embedded in front and rear that hold it in place so well I didn't need the three included straps to hold it in place. There are eyelets near front and rear plus center to attach the straps which would be helpful for long term storage but not needed for short-term use. I have a very aggressive Cardinal that attacks his reflection in my car windows so I bought this cover to protect the paint from his constant pooping. I can put the cover on or take it off in just a couple minutes. Edit: it was very windy yesterday and the cover came off so I installed the 3 straps and they held the cover in place. Also notice that Amazon says it is 18 layers in one place but 10 layers on the order receipt. In either case it does the job. Very pleased!