Extra-heavy cushioning will keep your feet warm and dry when you're mountaineering, ice climbing, or multi-day backpacking. These Smartwool Men's Classic Mountaineer Maximum Cushion Crew Socks have arch brace which holds the socks in place. FeaturesFlat knit toe seam for additional comfortSmartwoolA(R) 2 Degree fit system with elasticized arch and ankle support designed to keep the sock in place74% Merino Wool/ 25% Nylon/ 1% Elastane