Cardigans and sweaters are wool, but the content of woolen sweaters is higher, and the feel of sweaters is much better than ordinary sweaters.
Here's how to identify sweaters and regular sweaters:
Look: see if it is different in thickness, see if the lines are uniform;
Touch: The sweater feels better, smooth and soft. Or ordinary sweaters may be tied;
Knowledge: There is a wool content on the card holder, and the content is higher, but the ordinary sweater is generally content;
Burning: You can sip a little bit of hair and smell it, smelling the smell of burnt feathers, and the quality of the sweater is relatively large.