Leave your power cord at home. These socks are fully charged with our Feel360™ fiber treatment that reacts to your body's temperature for high-performance comfort. Innovative and durable Infiknit™ technology guarantees no holes or rips... for life. Merino Wool Blend: 39% nylon, 30% wool, 28% polyester, 3% elastane. Medium Cushioning: Moderate cushioning throughout the sock for a secure fit with enhanced impact protection.