Farm to Feet Women's Billings Lightweight Crew Socks 66% Merino Wool 31% Nylon 3% Spandex Made in US Merino wool is soft, itch-free, naturally odor and bacteria resistant, cool in the summer and warm in winter Advanced construction of hidden nylon plaiting creates a smooth exterior and a low-profile fit that is ideal for technical and sport socks Bottom-of-foot cushioning across the entire sole provides shock-absorption that reduces impact from running and hiking and fitted instep reduces bulk Half-density cushioning adds softness and wicking performance without dramatically affecting sock thickness - ideal for casual socks Reinforced construction and low-stress seam placement reduce wear and tear, increasing the life of the sock