Pure wool should be marked with pure wool, and blended products should be marked with wool content, otherwise it can be identified as fake;

Check the texture:

Real sweaters are soft, elastic, feel good and warm, while fake sweaters are poor.

Combustion inspection:

It smells of burnt feathers, and it is pure wool when crushed with your fingers. If the ashes are not crushed or caked, it is a chemical fiber fabric.

Friction electrostatic inspection:

Rub on the cotton shirt for 5 minutes, and then separate quickly. If there is no "snapping" sound, it is true. If there is noise or even electrostatic spark, it is chemical fiber fabric.