Hot Chillys Men's Hi Volume Sock 60% Micro Supreme yarns, 20% silver embedded yarns, 12% Stretch Nylon, 5% Lycra and 3% MTF Polyester. Engineered to be worn where comfort and warmth are priority over edge control MTF cushioning, arch support and air channeling provide added moisture control Bio-Silver antimicrobial fibers provide odor control Smooth Looped Toe and Heel closures offer maximum comfort Elasticized ribbed cuff eliminates roll down