This cold weather sock is made of 62% hi-bulk acrylic, 20% stretch nylon, 17% worsted wool, and 1% Lycra spandex. It features a fully-cushioned foot and lower leg, flat toe seams for added comfort, and strong reinforced heel and toe areas.For over 115 years, Carhartt has manufactured premium workwear known for exceptional durability, comfort, quality of construction, and fit that you can feel in the fabrics and see in the performance.