Blue Flame Thermal Socks, Men's US Shoe Size 9-12 92% Acrylic, 6% Polyester, 2% Spandex Imported Do Not Bleach, Wash Normal, Do Not Iron, Dry Normal (Medium), Do Not Dry Clean World's Warmest Thermal Socks Designed for: Hiking and Outdoors Heavyweight Looped Cushioning Fleece-like Ultra-Soft Lining Moisture-Wicking and Odor Resistant