What to cover my run with that will hold up to snow?

I've built a run that is 12' x 19' with 6' tall walls. There is 2"x4" welded wire covering the walls of the run, with 1" hex net along the bottom 24" ans as a skirt. I was going to get deer netting and just drape & it over the top (I set a support across halfway across the short side), but this would require taking it down in the winter. I would really like something a bit stronger that has openings big enough to not get torn down by snow if possible. We get snow from Nov. thru Mar. and can get 2-3' at a time in a good storm. I really can't afford a permanent roof, and that would block light to all the new windows I cut into the coop wall.

What have you used that offered a bit more protection than deer netting and could stay up all winter? Where did you buy it and what size rolls?