A pen skirt is hardware cloth, that extends about 3 feet from the outside bottom of the coop, outward. I connected my pen skirt to the coop with the staples you hammer in. You can bury the wire, but I kept my pen skirt in place with sod staples, until the grass grew through it enough to keep it secured. It didn't take long for the grass to anchor it down, and now I can safely mow over the entire thing.