Size:M/L Material:90% Nylon+10% Spandex Pack:1PC with Opp Bag SIZE: Fabrics of different materials have different elasticity, so different styles of the same size will have a little difference in tile size. Thank you for your understanding. Cleaning considerations： Hand wash with warm water about 30degree. Do not soak for too long. Underwear is close-fitting and intimate clothing, which is easy to breed bacteria. For our health, it is recommended to change it every six months.