TACTICAL Over the Calf | Heavyweight with Full CushionThe warmest and tallest sock in the line, the Extreme Cold Weather Mountaineering over the calf sock is designed for extreme climate on rugged terrain. Featuring full terry loop cushioning throughout for maximum warmth. Elastic support at arch. Reinforced heel and toe for increased durability. Materials: 79% Merino Wool 20% Nylon 1% Lycra Spandex Height: OTC Weight: Heavyweight Pair with: Military combat boots, tactical boots, ocp boots Size Chart