60 percent Acrylic, 20 percent Merino Wool, 17 percent Nylon, 3 percent 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. Made in the USA.