The International Wool Bureau, the owner of the pure wool mark, was founded in 1937 and has now developed into an international organization. The International Wool Bureau currently has three wool product marks: "Pure Wool Mark", "High Proportion Blended Mark" and "Wool Blended Mark". Except for the wool content, the products with the above three marks have the same product standards. Only products whose quality fully meets the quality requirements of the International Wool Bureau can use the International Wool Bureau wool product mark. The wool fiber content of various wool marks is: the use of pure wool marks requires pure new wool to be no less than 93%; the use of high-proportion blended marks requires the wool content to be no less than 50%; the use of wool blend marks requires the wool content to be between 30% and 30%. between 50%.