65 percent Acrylic, 20 percent Merino Wool, 13 percent Nylon, 2 percent Spandex. 2 Pair Pack. Wool for year round wear. 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.