We did the apron out of the 1x2 fencing wire, and even plain chicken wire. It's mainly just to keep them from digging, so unless you have small critters that will dig in one spot, the bigger stuff works fine. Anything very small like mice, are going to get through anyway. But foxes, etc, won't keep digging when they can't find the edge of the apron. See they dig close to the bottom of the fence, then aren't smart enough to dig outward. Some of mine is covered, some is right on top the ground, with just a few boards/logs laying on it. Grass will grow up between the spaces if nothing tramples it down.