Fine wool sheep with mainly merino descent can be found all over the world, which produces about one third of the world total wool production amount. In which Australia Merino wool production (greasy) is about 350,000 tons, equivalent to 40% of the world's fine wool yield, therefore is the largest producer and supplier of Merino wool. By wool fineness Australian Merino wool can be divided into four grade: superfine wool with quality counts more than 70, an average diameter of 18 microns or less and length from 5 to 9 cm; fine wool type with quality counts 70 to 66, average diameter of 18 to 20 microns and a length of 5 to 10 cm; medium wool with quality count 66 to 64, average diameter of 20 to 22 microns and length of 6 to 11 cm; rough wool with quality count 64 to 60, the average diameter of the 23 to 25 microns and length from 6 to 12 cm. Those four were made into yarns or textile materials suitable for mid-range, high-grade or high-quality clothing. In Consinee- Top Line, superfine merino wool is used to blend spun with super kid mohair, polyamide fiber and made into luxurious brushed yarn with fluffy feel.

Merino sheep is a main parent to cultivate major semi-fine sheep. New Zealand has cultivated semi-fine variety Corriedale sheep by hybridizing long-haired Lincoln sheep and Merino sheep. Corriedale wool quality is between wool of Lincoln and Merino wool; By mating Merino sheep ram with Lincoln ewes and Merino generation hybrids, and by the ideal self-group breeding of  their offspring born, we got sheep with three-quarters of Merino sheep descent such as Boer Wentz or Columbia sheep. Their wool quality count is 60 to 58, with an average diameter of 23 to 25 microns and length from 10 to 13 cm.

China began to introduce the Australian merino sheep in 1972 to improve the length, color, pure wool content and fineness of China sheep wool. And the result is very effective.