DECENT FEATURES of the Smartwool Trekking Heavy Crew Sock WOW Technology in reinforced sole for maximum comfort and durability 3x1 ribbed cuff Sizing clearly indicated on the sock Flat knit toe seam Elasticized arch brace The SPECS Height: Crew Cushioning: Heavy Full-Cushioned Fabric: 80% Merino Wool, 19% Nylon, 1% Elastane