All the same warmth as the original™ heat holders® crew sock, but in an extra-long leg length - plus elasticated foot & ankle support. Works really well with boots and great for spending time outdoors during the cold winter months.  # Pieces In Set: 1 Pair Features: Breathable, Insulated Shoe Size Range: 7-12 Fiber Content: 91% Acrylic, 5% Nylon, 3% Polyester, 1% Elastane Fabric Description: Thermal Care: Machine Wash, Line Dry Country of Origin: Imported