Full plush lambs wool cushioning throughout arch support. Flat toe seam stretchs fibers from toe to toe for snug fit. Impact areas reinforced with double nylon for durability. Guaranteed comfort. Machine washable and machine dryable. 85% Merino lambswool, 13% stretch nylon, 2% spandex. Sock size charts: Small: Men 4-6.5, women 5-6.5. Medium: Men 6-8.5, women 7-9.5. Large: Men 9-11.5, women 10-12.5. X-Large: Men 12-14.5, women 13+. Material: Wool.