What grade is red bean underwear?

Middle and high grade. Red bean underwear 1957 started spinning and weaving, and 1997 won the title of China famous trademark. In 2006, it was a bumper harvest year for red bean underwear: the products won the honors of top ten brands of knitted underwear in China and top ten brands of thermal underwear in China, and were rated as national inspection-free products, with sales of 440 million yuan that year.