Our classic best selling Organic Cotton Crew Socks...available in a special 6-pair-pack! Perfect for men or women and versatile enough for dress or casual wear. Contents:89% Certified Organic Cotton, 10% Nylon, 1% SpandexWashing Instructions:Machine Wash Warm, Tumble Dry LowSizing:Medium = women's US shoe size 5-9 & men's US shoe size 4-7Large = women's US shoe size 10-13 & men's US shoe size 8-12Colors:White = 6 pair white Black = 6 pair black