Extra warm thermal socks designed for sub-zero temperatures. The fabric we used has a high weight, excellent thermal insulation properties, and it’s very elastic to adapt to your feet. The top part is fitted with an elastic band for a snug fit in a desired height. The design of XTREMO is in black and grey with orange graphics of a flame, with red and white elements, and with a big grey logo Delphin. They are available in three versions that cover a large scale of sizes so you can pick the right one for you. Technical information: Material: 85% cotton, 10% elastane, 5% polyester