Ultrafine wool (< 20 microns)
Merino: Exceptionally soft, temperature-regulating, breathable, and odor-resistant – ideal for clothing and shoes worn directly on the skin.
Fine wool (20–25 microns)
Rambouillet & Polwarth: Soft, elastic, and more durable than Merino – perfect for fine knitwear.
Medium wool (25–31 microns)
Corriedale & Romney: Versatile and long-lasting, ideal for sweaters and blankets, with a slightly coarser texture.
Coarse wool (32–40+ microns)
Scottish Blackface & Karakul: Very robust and insulating – ideal for felt, tweed, and carpets.
Summary:
Luxury & comfort: Merino, Rambouillet, Polwarth
Versatility: Corriedale, Romney
Durability: Scottish Blackface, Karakul