I have tarps on 2 sides, covering 2/3's of the run so they still have sunshine, but they have a place for cover. It also breaks the wind. We also have a tunnel that is wood on the top and bottom and hardware cloth on the sides, but we've blocked 90% of it with wood for the winter to alleviate cold wind going into the coop. Our tunnel is about 9 ft long and connects the coop (converted shed) to the run.