An S number on the label of wool suits or other tailored apparel, wool fabric, or yarn, indicates the fineness of the wool fiber as measured by its maximum diameter in micrometres. Fiber fineness is one of the main factors determining the quality and performance of a wool product.
An S number on the label of wool suits or other tailored apparel, wool fabric, or yarn, indicates the fineness of the wool fiber as measured by its maximum diameter in micrometres. Fiber fineness is one of the main factors determining the quality and performance of a wool product.
Source: Wikipedia "S number (wool)" · CC BY-SA 4.0
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