3a underwear refers to the brand of Guangzhou 3A Healthy Underwear Body-building Co., Ltd., which is the leader of China underwear industry. 3a underwear company is a formal company with official certification, not a pyramid scheme. The brands operated by the company are also within the scope permitted by law. Very reliable. MLM refers to the illegal acquisition of wealth by developers or the requirement that the developed personnel obtain the qualification to join on the condition of paying a certain fee.