High density cushioning surrounds entire foot and shin. Available in either custom shrink treated Merino wool or our exclusive blend of Coolmax. Ribbing above the ankle ensures a proper fit. Reinforced heel and toe. Elastic support around the arch. Ring toe construction for a comfortable, invisible seam. Contents Contents: CHARCOAL: 41% Coolmax Polyester, 27% Nylon, 26% Acrylic, 5% Lycra Spandex, 1% Other fiber LIGHT BLUE: 43% Coolmax Polyester, 26% Nylon, 20% Acrylic, 6% Polyester, 5% Lycra Spandex.