Durable cotton crew socks. Working Series socks are designed to stand up to the rigors of daily wear. Features high-bulk acrylic fibers in the footbed that never go flat and provide extra cushion for all day comfort. Ultra-soft cotton material, stay-up comfort top, reinforced toe & heel, and padded toe for comfort in steel-toe boots. 70% cotton, 19% acrylic, 8% nylon, 2% polyester, 1% Lycra spandex.