With 82% ultra fine Merino wool content, crew leg height and a performance fit system, this all-seasons midweight hiking/trekking sock has extended durability zones for long-lasting performance. Elasticized arch support and heavy cushioning in the foot-bed to reduce foot fatigue, which is a must for your multi day treks. Comfort welt and graduated leg tension for form-fitting stay up all day comfort. Knitted with a 100% unblended RWS certified Merino wool yarn, then plaited with stretch nylon and spandex during the knitting process for that unmatched comfort, second skin fit, and long lasting durability. Merino wool is highly breathable, thermo-regulating, moisture-wicking, and odor resistant. Proudly designed and manufactured from start to finish in Canada with Canadian sourced materials. Machine washable for easy care.