Merinos are regarded as having the finest and softest wool of any sheep. This breed was originated in Spain around 12th century, and refined in New Zealand and Australia since 18th century. SELECTED FABRIC: 81% Merino wool, 14% Polyester, 3% Spandex, 2% Nylon.High content fine merino wool makes the athletic casual socks performance well in cold winter. LUXURY WARMTH & COMFORT: 81% Merino wool socks with terry cushion sole provides additional damping,providing thermal warmth and luxury comfort. ARCH SUPPORT:Enhance arch band provides full wrapping to keep the thick winter socks always in place.Perfect as an athletic crew socks for men and women to enjoy hiking, running, tennis, cycling and any other outdoor sports in cold weather. SEAMLESS TOE & MESH CONTRUCTION: Seamless toe seam of the crew socks are design for reducing irritating and providing comfort.Special mesh construction on the instep of the dress wool socks maximizes breathability. WASHING TIPS??Machine Wash Cold.No Blend ,No Iron.Let the dress wool socks air dry rather than use dryer will make it hardly shrank. Minor pilling of wool is common with merino wool yarn.