The elasticized arch brace of the Classic Hike Full Cushion Solid Crew from Smartwool will ensure a secure fit while you hike. But that's not all there is to like about this classic sock. You'll also enjoy a flat knit toe seam for in-shoe comfort as well as enhanced durability from sustainable, recycled nylon. Model: SW001646D11 Full cushion 67% Merino Wool / 8% Nylon / 23% Recycled Nylon / 1% Elastane / 1% Polyester Flat knit toe seam for additional comfort Elasticized arch brace for secure fit