Silver has been used as a powerful anti microbial agent for many centuries this product is treated with silver which controls the development of foot nasties such as smelly bacteria and fungus resulting in fresh happy feet they are clinically tested to last up to 15 washes after normal wear they have a 15 denier appearance along with a strong durable toe and an anatomically designed comfort top they stay comfortably in place all day long with three pairs in a pack they are great value for m