Folks rayon made from bamboo is not an environmentally friendly process. To convert bamboo fiber to rayon bamboo is reduced to cellulose fiber, which is treated through various processes with a bunch of chemicals in this order – caustic soda, carbon disulfide, and sulfuric acid. Cotton is a pure natural product by comparison. If you are buying rayon towels because they have great colors and have other features that you like. That is great! However, don’t think you are helping the world become less polluted just because the raw material used to make rayon is bamboo grass. There is zero bamboo fiber woven in rayon bamboo towels. Rayon is used in a wide variety of products from skirts to tires.