Understanding Suit Fabric Super Numbers: What They Are and Why They Matter

What Are Super Numbers?

Super numbers refer to the fineness of the wool used in the fabric. The wool is measured in microns—its diameter determines the Super rating. A Super 100 fabric contains wool fibers with a diameter of about 18.5 microns, while a Super 150 fabric uses even finer fibers, around 16 microns. The higher the number, the finer the wool, and thus the softer and smoother the fabric feels.

Note: Super numbers don’t measure the weight of the fabric but the fineness of the wool fibers.

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