Devoted to comfort is Smartwools The Breadwinner sock. Designed with a stretch arch brace that is supportive and comfortable. By nature, Smartwool fabrics manage moisture and odor for healthy feet. Product features include: Fabric is 90 percent wool, 8 percent nylon, and 2 percent spandex, Pre-pack of 3 socks, Made with New Zealand Merino wool, Smooth toe seam, Non-cushion sole.