Eurosocks Approach Silver Boot Socks 70% Silver Drystat/ 15% nylon/ 10% acrylic/ 5% Spandex Imported Superior moisture management that inhibits the growth of bacteria and molds. Reduces unpleasant odors and maintains the biological balance. Assures a perfect equilibium between temperature and relative humidity This medium weight hiking sock has all the bells and whistles for maximum comfort and fit like woven arch and ankle supports Medium density padding absorbs shock and eliminates friction