Only the originals will dowhen the original heat holders are that bit too chunky and bulky for your shoes or boots now you can choose heat holders lite socks ndash a medium thick version of the ultimate thermal socks this lsquoslimmerrsquo lightweight version has been designed for everyday casual fit footwear but still provide the thermal protection and comfort heat holders are known forthe advanced insulating yarn still gives the high performance and superior moisture wicking abiliti