Wool grading

Super extra fine wool = Super 120's
Means the fiber is no more than 17,5 microns.
Extreamly soft

Extra fine wool = Super 100's
Means the fiber is no more than 18,5 microns.
Very soft

Fine wool = Super 80's
Means the fiber is no more than 19,5 microns.
Soft

(1 micron is 1/1000 000 m and a human hair 50-120 microns to compare)