80% Rayon made from Bamboo, 18% Polyester, 2% Spandex THE PERFECT WORK BOOT AND/OR HIKING BOOT SOCKS: These super comfortable premium Men’s Bamboo Rayon 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! MOISTURE WICKING- Bamboo Rayon can be naturally moisture wicking so can pull moisture away from the skin, allowing it to evaporate to keep your feet dry! PREVENT SWEATY FEET- The bamboo rayon fibers in these socks are naturally temperature regulating to keep your feet comfortable even in extreme temperatures.