Pro-Tect Copper & Merino Wool Hiking Crew Sock - 1 Pair 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. Merino Wool to wick moisture away from your feet keeping them moisture free and comfortable. Extra Arch Support & Padding In The Heel & Ankle Areas For Full Cushion Feeling While Trekking Your Favorite Trails Leg Compression With Stretch Lycra For The Perfect Compression Sock Feeling Without Being Too Tight 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 62% Merino Wool - 13% Nylon - 11% Copper Oxide Polyester - 11% Polyester - 3% Lycra Spandex