Gorilla Hair is shredded Redwood shipped down from Northern California. It contains natural chemicals that are harmful to pests like moths, rodents, ants, fleas, and cockroaches. Unlike some mulches that move here and there when the wind blows, gorilla hair stays wherever it is placed. It mats and merges together to form a bonded structure that isn’t easily displaced. It is a good choice for a steep area where other mulches tend to fall down the slope.