The Smartwool Men's Performance Run Targeted Cushion Crew Sock is a run specific sock for putting in all the miles. Socks, then shoes. The targeted cushioning focUses all the comfort at the heel and ball of your foot, right where you need it most. The crew height prevents trail debris from hitting your lower shins and a 4 Degree Elite Fit System provides a Performance Fit with flex zone that won't move about. The Indestructawool construction Technology increases not just durability but comfort, getting the most out of the merino wool, nylon and elastane blend. Features of the Smartwool Men's Performance Run Targeted Cushion Crew Sock Virtually Seamless toe for enhanced comfort 8.5in. Height Fabric Details 57% Merino Wool, 41% Nylon, 2% Elastane