I have always covered outside stored boats on the Great Lakes just to keep the buildup of ice and hopefully moisture that can get into crevices and freeze causing damage. I was unable to find an affordable cover for current boat and shrink wrap seemed to a lot to pay each year. I bought two semi truck lumber tarps and had them sewed side by side creating one 26’ by 48’ tarp with d rings and webbed strapping every couple of feet. I’m on year five and it’s holding up well. The down side is that the tarp weighs 240 lbs.