80% Rayon made from Bamboo, 18% Polyester, 2% Spandex Men's Size 9-12 Set of 3 Pairs of Socks THE PERFECT WORK BOOT AND/OR HIKING BOOT SOCKS: These super comfortable premium Men’s Bamboo Rayon Quarter High Crew Socks are the perfect socks for your work boots or hiking boots. They will keep your feet comfortable even after hours of hiking or working in extreme temperatures. These socks are also great for everyday wear to keep your feet comfortable, dry, and odor free all day long! The come up to about the mid to upper calf. MOISTURE WICKING- Bamboo rayon fibers can be naturally moisture wicking pulling moisture away from the skin, allowing it to evaporate to keep your feet dry!