I built a rack and was looking to cover the poly boats individually. The are hung in 4" web slings. I see some ideas on line when I searched. Other option is to have custom made by canvas which is probably expensive. What material is best? Any personal experience with stuff online? I see them from 50 bucks to over 250. I would like something to last a number of years. Thanks for any tips. I was thinking along the lines of these http://www.kayakcoversofcharleston.com/

or these http://www.danuu.com/html/BuyNow.htm

I'll ask my bat canvas guy tomorrow.