The High Boot Sock is a high, knitted sock in 78% merino wool, 18% nylon, 2% acrylic and 2% Lycra. Merino wool is a natural material renowned for its optimal moisture wicking, and its ability to retain heat even when wet. Terry-knit inside for maximum durability, comfort and warmth. Elastic knitted details around the leg and in the foot for a good fit. To prevent chafing on long hikes, the front leg is reinforced and the toe seam is underneath the foot.