100% TERRY CONSTRUCTION FOR ADDED WARMTH AND PADDED COMFORT HIGH THERMAL RETENTION VALUE TO HELP HOLD HEAT IN ANKLE SUPPORT STRETCH BAND TO HELP KEEP SOCK IN POSITION, NO SLIPPING OR BUNCHING ARCH SUPPORT STRETCH BAND TO HELP KEEP SOCK IN POSITION, NO SLIPPING OR BUNCHING PATTERNED BEND TO PREVENT BUNCHING IN ANKLE WHEN BENDING ABOVE CALF HEIGHT FOR WARMTH AND COMFORT NYLON REINFORCED TOE, HEEL AND SOLE FOR ULTIMATE DURABILITY 60% MERINO WOOL WOOL, 24% POLYAMIDE, 16% LYCRA *Note that the use of a technical sock is required to obtain the full functionality of GORE-TEX® boots.