1x1 rib fabric uses unique yarns to create a comfortable and warm wool garment. Nylon has been added to improve the durability of the fabric. Double seat for warmth. Cuffs reinforced with spandex for comfort and shape retention. Leg gussets give thighs extra room for proper fit . Plush back signature elastic waistband. 90% superwash wool\ 10% nylon. Made in Canada.