The newly arrived rook block twist crew sock features the same warmth and comfort as the original™ heat holders® crew sock, but with a striking and fashionable block twist design!  # 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