Netting for top of run?

[Hegatha]

I am in the process of building my coop and run and I wanna know what material would be best for the top of the run since its gonna be large at least 40x40.
Thanks

 

[Fancypants1]

We just built our coop and covered the run as well as under the coop with plain old chicken wire. Just make sure you have supports thru out to support the wire.