Sweater refers to velvet knitted long-sleeved sports leisure fir. Sweaters are generally thicker than ordinary long sleeves. Its cuffs are tight and elastic, and the material under the clothes is the same as that of the cuffs. Sweaters were born in new york in 1930s, and they were the tools of cold storage workers at that time. However, because of its comfort and warmth, sweaters gradually gained the favor of athletes, and soon became popular among football players' girlfriends and music stars.

Sweaters are generally generous in style, giving consideration to fashion and functionality, and combining the characteristics of comfort and fashion. They are very popular in casual wear and gradually become the first choice for young people to exercise in the streets.