Wrightsock Women's Silver Elite Tab 3 Pack Athletic Socks Outer: 68% Polyester, 28% Nylon, 4% Lycra Spandex; Inner: 65% Polyester, 30% Nylon, 5% Silver Machine Wash The silver elite offers all the technology of a midweight double layer coupled with the benefits of silver offers protection from the bacteria associated with smelly feet Offers all the thermal conductivity and reflectivity properties of silver Keeps you comfortable in all weather conditions Stabilizer zone to help lock the sock in place