The J.B. Field’s 30 Below Classic is already our most popular sock and the bestselling thermal winter sock in Canada, but due to high demand for a longer length we have designed an over-the-calf version! This line of thermal winter socks was designed for people who require a sock that can keep their feet dry, warm, and comfortable in the most extreme conditions… but now it can cover more leg, making it the ideal ski sock!Soft, warm, and durable: Merino Wool is a versatile fiber that wicks away moisture and keeps your feet dry, blister-free, and smelling great. Due to a lower micron width per strand, it is a finer type of wool without the itch.Content70% Merino Wool30% NylonLarge (Men’s 8-12 Shoe / Women’s 913 Shoe)