This cover is very heavy vinyl with a thick backing and is now in it's fifth season with no signs of failure anywhere. My daughter has a 1995 boat that I bought new and I made the cover for it as well. It is now 13 years old and the last five years it's been stored outdoors. Still going strong. Do not use a cheap grade of vinyl as it simply won't stand up. There are lots of other fabrics that are lighter and breathe a little better (Sunbrella is just one) but quality vinyl will take a beating at freeway speeds.