Wool knitting, such as the sweaters we often wear and the knitwear in spring and summer, is a piece of wool yarn woven by a horizontal machine to make each piece of cloth, and then connected by a sleeve machine, just like a sewing machine to connect cloth pieces, but the equipment and way are different. These specific information can be found on many websites, and here I want to write some tips that can be useful when choosing knitwear.