No matter how cold it gets on your next outdoor excursion, your feet will be warm and happy in 40 Below II. The cushioned crew, elasticized arch and man-made materials make this sock a keeper. Cushioned crew Elasticized arch and ankle Low profile toe closure 38% Wool, 33% Stretch Nylon, 26% Rayon, 2% Stretch Polyester, 1% Spandex