Okay, check the authenticity of the logo, wool content and trademark anti-counterfeiting mark. If you want to verify that the wool contains chemical fiber, you can use about an inch of wool and put it on the fire of a lighter and ignite it. After the wool fire is extinguished, Smell it, it should smell like burnt chicken feathers. The burnt ash turns black and is twisted into powder by hand. If it is particularly hard and ball-shaped, it means it contains less hair.