Mercerized cotton can refer to both cotton yarn treated by yarn mercerizing process and cotton fabric treated by fabric mercerizing. Among them, yarn mercerization refers to a special kind of cotton yarn, which has the original characteristics and silky luster of cotton after being treated with concentrated caustic soda under tension. Fabric mercerization refers to the treatment of cotton fabric with concentrated caustic soda under tension, which makes the fabric more shiny, crisp and shape-preserving.

Mercerized sweatshirt is a thin knitted fabric. Because of its strong hygroscopicity, it is often used as close-fitting clothing. Generally, fine or medium cotton or blended yarn is woven into single-sided or double-sided fabric on warp knitting machine or weft knitting machine, then dyed, printed and finished, and then cut into various styles of undershirts and vests. Common undershirts include bleached undershirts, extra-white undershirts, fine bleached undershirts and singed mercerized undershirts; According to the different dyeing and finishing processes, there are plain jersey, printed jersey and navy striped jersey. According to the different raw materials used, there are blended sweaters, silk sweaters, acrylic sweaters, polyester sweaters and ramie sweaters.