Grades!

Grade 1-Royal - Less than 20 microns -To wear next to the skin garments

Grade 2-Superfine - 20-22.9 microns - Gently used items such as shawls and baby items

Grade 3- Fine - 23-25.9 microns- Most versatile grade, all purpose

Grade 4- Medium - 26-28.9 microns - Socks, throws, outerwear and felt

Grade 5-Intermediate - 29-32 microns- Batts, duvets, outerwear and felt

Grade 6-Strong - 32.1-35 microns - Batts, insulation and rugs

In comparison:
Merino – 24 microns or less
Cashmere – 16 – 19 microns
Mohair/Angora 23-35 microns
Human Hair 50-120 microns
Camel (down fibers) 17-24 microns
(primaries)
Yak (down fibers) 20- 30 microns
(primaries) 75-90 microns
Buffalo (down fibers) 12-29 microns
(primaries) 20-110 microns