We are an advanced textile company.We guarantee you that we are the only firm to provide an undershirt of such superior quality and various specification for a lower price(compared to other V-neck sweat proof undershirts).These undershirts are made of micro modal lenzing material and Spanx. The result is a superior material which can absorb more moisture than cotton. This product is machine washable and dryer safe. Please wash the clothes inside out to ensure the moisture absorbed is effectively removed