60% Acrylic, 20% Merino Wool, 17% Nylon, 3% Spandex. 2 pair pack. Naturally moisture wicking comfort. Thermal insulating wool blend. Naturally odor resistant wool. Thick full cushion comfort. Embedded arch support fights against foot fatigue. Reinforced heel and toe maximize protection. Ribbed stay-up top for a secure, comfortable fit. Smooth toe seams provide all day comfort. Mid calf fit. Made in the USA.