Mens WOOL 2.7 Tog Original Thermal Heat Holders Socks 7-12 usa Black 70% Wool, 27% Polyamide, 3% Elastane Genuine Mens Original Length Heat Holder Socks by Sockshop The long pile cushioning in the soles and legs will give you comfort and warmth throughout the day. 2.7 Tog rating, ultra warm - The warmest Heat Holder sock yet! One size to fit Mens 7-12 usa Other colours and sizes in our Amazon store