Men's Socks 55% Merino wool 41% nylon 4% elastane 4 Degree™ Elite fit system Indestructawool™ technology Ultralight cushioning Over the calf fit Mapped zones with mesh breathability Shred Shield™ toe design Smartwool Men's PhD Ski Ultra Light Socks give you exceptional comfort with high breathability and superior fit. Get the technical precision fit you want in comfortable Merino wool in a durable design. Smartwool Men's PhD Ski Ultra Light Socks