Features of the Smartwool Men's PhD Cycle Ultra Light Dialed Printed Crew Sock Indestructawool Technology for enhanced durability 4 Degree elite Fit system for a dialed, Performance-oriented Fit Shred shield Technology reduces wear from toes Body-mapped mesh zones for added breathability Virtually seamless toe for enhanced comfort 8.5in. Overall height Fabric Details 46% Merino Wool, 49% Nylon, 4% Elastane, 1% Polyester