J.B. Icelandic Artic Trail -40 Below Winter Sock (2 Pairs) Content- 85% PreShrunk Wool & 15% Nylon Pre-Shrunk Wool - We only use the finest quality of easy care wool in our socks because it is such a versatile fibre. Not only is wool breathable but it is great at helping regulate body temperature by keeping your feet dry and wicking away moisture helping prevent blisters and control odor. X-Hi Cushion - Full terry cushion for extra warmth and protection MADE IN CANADA!