These heavyweight boot socks will handle the most extreme weather. Made with state-of-the-art construction that features densely looped Uncrushable Merino™ lambswool for all-day soft comfort, nylon-reinforced impact areas, stretch fibers from top-to-toe to provide a snug fit, and vented-rib construction for better ventilation. Flat toe seam prevents blistering; elastic arch support zone increases foot circulation. 88% merino lambswool/10% stretch nylon/2% spandex. Made in the USA. Machine wash. 88% Uncrushable Merino™ wool/10% stretch nylon/2% spandex. Machine wash. Wool blend for warmth & dryness. Lin-toe® seam prevents blistering. Impact areas reinforced w/nylon for durability. Elastic arch support zone increases foot circulation. Stretch fibers from top-to-toe provide a snug fit throughout. Flat Complett seam for comfort. Use: extreme work or weather. Height: 14"-15" Sizes: S, M, L, & XL.