I use some of that shade cloth over one end of my run. It does make it a little cooler as it doesn't let in as much of the sun, plus it's breathable allowing air to pass through for ventilation. I put mine on 3 year's ago, attaching it with some grammars to the outside of the run and going over the top. I left it up all year round and it still seems to be holding up ok. I do have another one that I bought at the same time as that one, for when that one ever wear's out.