Thanks for everyone's help. I found a burlap shade cloth that is cheap and simple. I don't mind tearing it down and replacing it next summer. Now here is another question for everyone. The burlap is going to be installed today, before it gets any hotter. Should I do a gradual decrease in shading? We used 8ft boards with a post between each one,so the run is almost in thirds. I was thinking the first 1/3(closest to the coop) would be covered 6ft up, the second 1/3 would be 3 ft, and the last 1/3 would be open. This would allow them the option of no sun, partial sun, or full sun during different times of the day. The first 1/3 has a roof on it, so that whole area would be completely shaded if I went 6ft up with the burlap.