30% Polyester, 25% Acrylic, 20% cotton, 12% Merino Wool, 10% Nylon, 3% Spandex 2 Pair Pack Thermal insulating wool blend Naturally moisture wicking comfort Naturally odor resistant wool Full cushion support Reinforced heel and toe protection Embedded arch support fights against foot fatigue Comfortable stay-up top Smooth toe seams provide all-day comfort