It's a necessity, north of I-90
While 3 bikes are stored inside offsite during the winter there's at least one that hangs out in the driveway for those winter rides. A cover usually last at least 4 years, year round usage, and then it get consigned to the snowblower. At any given time as many as 3 of the bikes are outside with Dowco covers on them, no garage. Don't remember how I found Dowco, but I'm glad I did. Since 2006.