GroGreen FENCE SAFE 40100 OR 4' x 100' Orange Safety Tree Fence - This safety tree fence is a highly visible orange woven geotextile made of 100% polyethylene coated polypropylene fibers. It resists ultraviolet deterioration, rotting, biological degradation, naturally encountered basics and acids. Polypropylene is stable within a pH range of 2 to 13.