The 5.11 Merino Wool OTC (Over The Calf) Boot Sock is constructed from the fine yarn of merino wool, providing the solution for chilly climates or feet that tend to stay cold. Not only is wool known for its heat-retention properties, but also the very nature of wool fibres repels water for moisture-wicking dryness and comfort. Wool also fights odour-causing microbes to keep your feet fresh and healthy throughout the day or night. Enhanced arch and ankle support maximise agility, while reinforced heel, sole and toe increase the lifespan of the socks. Features: Merino wool Built from premium Merino wool Enhanced thermal yarns Terry loop construction at the ankle Moisture-wicking action Antimicrobial Enhanced arch and ankle support Reinforced heel, sole and toe 5.11 Merino Wool OTC Boot Sock