Cashmere is a layer of fine wool from cashmere goats (also known as Cashmere goats), with a diameter of 14-17um and a length of 30-45mm. Cashmere fiber is composed of cortex layer and scale layer, and its cross section is elliptical cylindrical. One cashmere goat produces only about 75g of non-wool per year, and five cashmere goats produce only enough wool to weave an ordinary cashmere sweater.