what is a micron?
A Micron is a unit of measurement used for wool fibre diameter. One micron equals one millionth part of a metre."
The finer the micron (lower the number), the softer a fabric will be next-to-skin. Wool fibres vary in diameter from 11 - 60 microns (Merino fibre is the finest of all wool types), compared to about 100 microns for human hair.