420 grams of sweater is very heavy. More than 400 grams are heavy sweaters. Sweaters were born in new york, USA in 1930s, when they were used as tools by cold storage workers. However, because of its comfort and warmth, sweaters are gradually favored by athletes, and soon they are welcomed by football players' girlfriends and music stars. Sweaters are generally generous, and casual clothes are very popular with customers. Sweaters have both fashion and function, and combine comfort and fashion, making them the first choice for street sports for young people.