The Caterpillar Black Thermo Work Socks are a 2-pack designed for men in UK size 11-14; each pack contains 1 black pair + 1 grey pair. - Natural Thermo Properties to Keep Feet Insulated. - Fully Cushioned Foot Base to Protect Skin from Friction. - Reinforced Toe and Heel for Use with Steel Toe Boots. - High Stetch Top for Ease of Wear - Made from a blend of 41% cotton, 41% acrylic, 17% polyester, and 1% elastane, these socks are machine washable and perfect for casual or workwear occasions.