Heat Holders® Men’s Robin ULTRA LITE™ twist thermal socks are 3X warmer than the average cotton sock in a lightweight profile ideal for formal shoes and tight-fitting shoes. The intensely brushed inner is super soft and comfortable and traps warm air next to your skin, keeping your feet warmer for longer on the cold days. # Pieces In Set: 1 Pair Features: Insulated Shoe Size Range: 7-12 Fiber Content: 89% Acrylic, 10% Nylon, 1% Elastane Fabric Description: Knit Care: Machine Wash, Line Dry Country of Origin: Imported