The Rocky Thermal Dry Knit Sock, Large, 2-Pack contains socks that are designed to offer maximum performance as well as comfort. These hunting socks are made of soft merino wool as well as stretch fibers from the toe to the top. The Rocky Sock, Men's Shoe Size 8-12, provides warmth, comfort and a snug fit. Each is made of 51 percent polyester, 24 percent acrylic, 15 percent wool, 9 percent nylon, and 1 percent spandex, and they are designed to help keep feet dry and comfortable. They also provide arch support. All the impact areas are reinforced for durability as well as comfort. They are machine washable for added convenience.