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.