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This paper reports on the characterization of the nano-wool fibrous materials that were obtained by using a patent pending technology to pulverise natural wool fibers into nano-scale particles in terms of morphology. After three steps pulverization, the nano-wool particles are in fibrous shape with length of around 80–300?nm, diameter of 10–80?nm and the mode particle size was around 100?nm. The surfaces of cotton fiber in a fabric treated with the nano-wool fibrous materials were covered a film of nano-wool fibrous materials, which change the water absorbency, thermal conductivity and Q_max values of the fabric significantly. These results indicate that the nano-wool fibrous materials can be used as a functional material for cotton fabrics treatment.