Pro-Tect Men&rsquo;s Copper & Merino Wool Heavy Duty Over The Calf Socks Soft Merino Wool to wick moisture from feet and Copper Oxide Anti-Fungal Fibers "kills" 99.9% of foot fungus after 12 hrs of contact leaving your feet feeling better while reducing odor. Soft Merino wool to aid in wicking moisture from feet keeping you comfortable all day long without that "scratchy" feel. Reinforced Y-Heel and Y-Toe for added protection and durability. Comfortable elastic band on top keeps sock in place and doesn't fall down. Spandex throughout sock for a compression like feel. Arch support in foot reduces fatigue and air vents down sides of feet to help moisture Black & Grey Heather =&gt; 76% Merino Wool - 14% Polyester - 8% Acrylic - 7% Copper Oxide Polyester - 2% Nylon 2% Spandex - Colored Tops/Natural Body =&gt; 67% Merino Wool - 13% Polyester - 7% Copper Oxide Polyester - 2% Nylon 2% Spandex Men's Sock Size =&gt; (Medium) Fits Shoe Size 6 - 8 1/2 - (Large) Fits Shoe Size 9 - 11 1/2 - (Extra Large) Fits Shoe Size 12 - 15