As consumers (especially urban women) continue to improve their living standards, they are more willing to buy better quality and functional underwear. According to statistics: China's underwear market has grown at a compound annual growth rate of about 20%. It has already exceeded RMB 100 billion, of which women's underwear accounts for about 60% of total sales. However, market growth is not driven by the expansion of sales. According to the China Wool Textile Industry Association, the sales of knitted underwear in major department stores in China remained relatively flat during the same period. In fact, the growth of the underwear market is mainly due to the price increase caused by the upgrade from ordinary underwear to functional underwear. Ordinary underwear is mainly made of cotton cloth, while functional underwear is made of functional fabric, which has functions such as intelligent heat preservation, waterproof, moisture wicking, antibacterial and deodorization. This market trend is beneficial to the advantage of manufacturing functional fabrics and underwear.