The J.B. Field's 40 Below Arctic Trail is one of the warmest thermal winter socks we make, containing 85% preshrunk wool! This style was designed for people who require a sock to keep their feet dry and warm in the most extreme conditions in Ottawa—as low as -40ºC ! Available at Irving Rivers 24 ByWard Market 

• Made in Canada 

• 85% wool

• 15 % nylon