WHEN TEMPERATURES FALL, YOUR FEET CAN BE THE FIRST TO SUFFER. ORDINARY THERMAL SOCKS OR WEARING MANY PAIRS WILL OFTEN LET YOU DOWN. TO BE CONFIDENT IN THE COLD YOU NEED A SOCK WITH HIGH INSULATION. HEAT HOLDERS HAVE BEEN TESTED TO ACHIEVE A THERMAL TOG RATING OF 2.34 UNIQUE 3 STAGE PROCESS USING HEAVY BULK YARN, PATENTED KNITTING TECHNOLOGY AND INTENSE BRUSHING HOLDS MORE WARM AIR CLOSE TO THE SKIN, ENSURING YOUR FEET STAY WARMER FOR LONGER. THESE SOCKS ARE MACHINE WASHABLE AND ARE MADE FROM 91% ACRYLIC, 5% NYLON, 3% POLYESTER AND 1% ELASTANE