Since wool is an all-natural fiber, it is good for you and good for the environment. Wool is a sustainable product. It may be a bit more costly from the beginning, but its longevity will more than pay for itself over time. A wool rug can easily last 20 to 25 years. After your wool area rug has lived out its life, since it is a natural product, it is completely biodegradable and will simply return to the earth.