Description Merino wool/nylon/polypropylene/lycra/elastane/polyester Twin Knit combines a durable exterior with a moisture-wicking interior Form-fitting True Rib leg will stay put without compression Moisture-wicking, odor resistant, and temperature-regulating wool blend Heel, arch, toe, instep and leg cushioning Arch support Enhanced heel pocket for secure fit Abrasion-resistant yarns in heel, arch and toe Ribbed channels improve ventilation on leg Imported