The concept of seamless knitting originated in the 1980s. In 1984, Italian company Shengge applied for the special rights of seamless underwear knitting machine, and seamless technology began to be applied in the underwear field. Seamless underwear requires the use of specialized seamless underwear production equipment to produce complete knitted products through weft knitting. Because different organizational structures are added to different parts of the product, there is no need to cut or sew, and it is a one-time formed underwear. Compared to traditional underwear, it has better elasticity and is more comfortable to wear.