Copper Antibacterial Athletic Ankle Quarter Socks Moisture Wicking for Mens and Womens 80% cotton 80% Combed Cotton/20% Antimicrobial Copper yarn - prevent painful blisters for training, sports, every day or simply relaxing. Size Chart:Medium size fits Shoe Size 6-12 US, Large size fits Shoe Size 12-14 US. Non-slip - "Y" shaped deep heel pocket ensures that the sock fits the contours of the foot so perfectly and WILL NOT SLIDE DOWN! Antibacterial & No odor - Copper can kill at least 99.9% of the bacteria and viruses within 2 hours. Antibacterial Copper nanoparticles kills bacteria in vitro reducing/eliminating those deadly smells. It helps to get rid of embarrassing smelly feet. Moisture wicking - Provides Soothes Aching Muscles, While the Fabric Maintains Airflow so Your Feet Stay Dry; Powerful moisture-wicking cotton with mesh venting blend keeps feet dry, inhibit bacteria growth.