Mid to high grade. Hongdou Underwear started spinning and weaving in 1957, and won the title of China's Well-known Trademark in 1997. 2006 was a bumper year for Hongdou Underwear: the product won the honor of the top ten brands of knitted underwear in China, the top ten brands of thermal underwear in China, and was It was rated as a national inspection-free product and achieved sales of 440 million yuan that year.