World's Softest Men's/Women's Classic Collection Crew Socks Acrylic Durable nylon provides a stretchy, long-lasting fit. Ultra soft acrylic offers plush softness and wicks away moisture for superior comfort. High stress heel and toe areas are reinforced for durable wear. 75% acrylic, 23% nylon, 1% polyester, 1% spandex. Care: Machine wash inside out in warm water. Tumble dry on low heat.