Venture with the reassuring comfort of Smartwools Trekking Heavy Crew sock. Its a full cushioning, heavyweight sock that naturally manages moisture and designed for your boot-ready backcountry to mountaineering journeys. Product features include: Flat-knit side panel, Supportive stretch arch, Pre-pack of 3 socks, Flat-knit toe seam, Fabric is 75 percent wool, 24 percent nylon, and 1 percent spandex, Made with New Zealand Merino wool.